diff --git a/src/main/java/fr/adrienbrault/idea/symfony2plugin/config/yaml/inspection/YamlDuplicateParameterKeyInspection.java b/src/main/java/fr/adrienbrault/idea/symfony2plugin/config/yaml/inspection/YamlDuplicateParameterKeyInspection.java
index b569de038..88e2936d0 100644
--- a/src/main/java/fr/adrienbrault/idea/symfony2plugin/config/yaml/inspection/YamlDuplicateParameterKeyInspection.java
+++ b/src/main/java/fr/adrienbrault/idea/symfony2plugin/config/yaml/inspection/YamlDuplicateParameterKeyInspection.java
@@ -1,10 +1,12 @@
 package fr.adrienbrault.idea.symfony2plugin.config.yaml.inspection;
 
 import com.intellij.codeInspection.ProblemsHolder;
+import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiElementVisitor;
 import com.intellij.psi.PsiFile;
 import fr.adrienbrault.idea.symfony2plugin.Symfony2ProjectComponent;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.yaml.psi.YAMLKeyValue;
 
 /**
  * @author Daniel Espendiller <daniel@espendiller.net>
@@ -14,7 +16,6 @@ public class YamlDuplicateParameterKeyInspection extends YamlDuplicateServiceKey
     @NotNull
     @Override
     public PsiElementVisitor buildVisitor(final @NotNull ProblemsHolder holder, boolean isOnTheFly) {
-
         PsiFile psiFile = holder.getFile();
         if(!Symfony2ProjectComponent.isEnabled(psiFile.getProject())) {
             return super.buildVisitor(holder, isOnTheFly);
@@ -22,8 +23,12 @@ public PsiElementVisitor buildVisitor(final @NotNull ProblemsHolder holder, bool
 
         return new PsiElementVisitor() {
             @Override
-            public void visitFile(PsiFile file) {
-                visitRoot(file, "parameters", holder);
+            public void visitElement(@NotNull PsiElement element) {
+                if (element instanceof YAMLKeyValue yamlKeyValue) {
+                    visitRoot(yamlKeyValue, "parameters", holder);
+                }
+
+                super.visitElement(element);
             }
         };
     }
diff --git a/src/main/java/fr/adrienbrault/idea/symfony2plugin/config/yaml/inspection/YamlDuplicateServiceKeyInspection.java b/src/main/java/fr/adrienbrault/idea/symfony2plugin/config/yaml/inspection/YamlDuplicateServiceKeyInspection.java
index 5a69d7029..7ff60bbd2 100644
--- a/src/main/java/fr/adrienbrault/idea/symfony2plugin/config/yaml/inspection/YamlDuplicateServiceKeyInspection.java
+++ b/src/main/java/fr/adrienbrault/idea/symfony2plugin/config/yaml/inspection/YamlDuplicateServiceKeyInspection.java
@@ -1,16 +1,13 @@
 package fr.adrienbrault.idea.symfony2plugin.config.yaml.inspection;
 
 import com.intellij.codeInspection.LocalInspectionTool;
+import com.intellij.codeInspection.ProblemHighlightType;
 import com.intellij.codeInspection.ProblemsHolder;
+import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiElementVisitor;
 import com.intellij.psi.PsiFile;
-import com.intellij.psi.util.PsiTreeUtil;
 import fr.adrienbrault.idea.symfony2plugin.Symfony2ProjectComponent;
-import fr.adrienbrault.idea.symfony2plugin.util.yaml.YamlHelper;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.yaml.YAMLUtil;
-import org.jetbrains.yaml.psi.YAMLCompoundValue;
-import org.jetbrains.yaml.psi.YAMLFile;
 import org.jetbrains.yaml.psi.YAMLKeyValue;
 import org.jetbrains.yaml.psi.YAMLMapping;
 
@@ -30,25 +27,41 @@ public PsiElementVisitor buildVisitor(final @NotNull ProblemsHolder holder, bool
 
         return new PsiElementVisitor() {
             @Override
-            public void visitFile(PsiFile file) {
-                visitRoot(file, "services", holder);
+            public void visitElement(@NotNull PsiElement element) {
+                if (element instanceof YAMLKeyValue yamlKeyValue) {
+                    visitRoot(yamlKeyValue, "services", holder);
+                }
+
+                super.visitElement(element);
             }
         };
     }
 
-    protected void visitRoot(PsiFile psiFile, String rootName, @NotNull ProblemsHolder holder) {
-        if(!(psiFile instanceof YAMLFile)) {
-            return;
-        }
+    protected void visitRoot(@NotNull YAMLKeyValue yamlKeyValue, String rootName, @NotNull ProblemsHolder holder) {
+        if (yamlKeyValue.getParent() instanceof YAMLMapping yamlMapping) {
+            String keyText1 = yamlKeyValue.getKeyText();
+            if (!keyText1.startsWith("_")) {
+                if (yamlMapping.getParent() instanceof YAMLKeyValue yamlKeyValue1) {
+                    if (rootName.equals(yamlKeyValue1.getKeyText())) {
+                        int found = 0;
+                        for (YAMLKeyValue keyValue : yamlMapping.getKeyValues()) {
+                            String keyText = keyValue.getKeyText();
 
-        YAMLKeyValue yamlKeyValue = YAMLUtil.getQualifiedKeyInFile((YAMLFile) psiFile, rootName);
-        if(yamlKeyValue == null) {
-            return;
-        }
+                            if (keyText1.equals(keyText)) {
+                                found++;
+                            }
 
-        YAMLCompoundValue yaml = PsiTreeUtil.findChildOfType(yamlKeyValue, YAMLMapping.class);
-        if(yaml != null) {
-            YamlHelper.attachDuplicateKeyInspection(yaml, holder);
+                            if (found == 2) {
+                                final PsiElement keyElement = yamlKeyValue.getKey();
+                                assert keyElement != null;
+                                holder.registerProblem(keyElement, "Symfony: Duplicate key", ProblemHighlightType.GENERIC_ERROR_OR_WARNING);
+
+                                break;
+                            }
+                        }
+                    }
+                }
+            }
         }
     }
 }
diff --git a/src/test/java/fr/adrienbrault/idea/symfony2plugin/tests/config/yaml/inspection/YamlDuplicateParameterKeyInspectionTest.java b/src/test/java/fr/adrienbrault/idea/symfony2plugin/tests/config/yaml/inspection/YamlDuplicateParameterKeyInspectionTest.java
new file mode 100644
index 000000000..24f8aaabe
--- /dev/null
+++ b/src/test/java/fr/adrienbrault/idea/symfony2plugin/tests/config/yaml/inspection/YamlDuplicateParameterKeyInspectionTest.java
@@ -0,0 +1,34 @@
+package fr.adrienbrault.idea.symfony2plugin.tests.config.yaml.inspection;
+
+import fr.adrienbrault.idea.symfony2plugin.tests.SymfonyLightCodeInsightFixtureTestCase;
+
+/**
+ * @author Daniel Espendiller <daniel@espendiller.net>
+ *
+ * @see fr.adrienbrault.idea.symfony2plugin.config.yaml.inspection.YamlDuplicateServiceKeyInspection
+ */
+public class YamlDuplicateParameterKeyInspectionTest extends SymfonyLightCodeInsightFixtureTestCase {
+
+    public void testDuplicateServiceKeyProvidesWarning() {
+        assertLocalInspectionContains("services.yml", "" +
+                "parameters:\n" +
+                "  fo<caret>o: \n" +
+                "  foo: ~\n",
+            "Symfony: Duplicate key"
+        );
+
+        assertLocalInspectionContains("services.yml", "" +
+                "parameters:\n" +
+                "  foo: \n" +
+                "  f<caret>oo: ~\n",
+            "Symfony: Duplicate key"
+        );
+
+        assertLocalInspectionNotContains("services.yml", "" +
+                "parameters:\n" +
+                "  foo1: ~" +
+                "  f<caret>oo: ~\n",
+            "Symfony: Duplicate key"
+        );
+    }
+}
diff --git a/src/test/java/fr/adrienbrault/idea/symfony2plugin/tests/config/yaml/inspection/YamlDuplicateServiceKeyInspectionTest.java b/src/test/java/fr/adrienbrault/idea/symfony2plugin/tests/config/yaml/inspection/YamlDuplicateServiceKeyInspectionTest.java
index c2103bf06..e9494df15 100644
--- a/src/test/java/fr/adrienbrault/idea/symfony2plugin/tests/config/yaml/inspection/YamlDuplicateServiceKeyInspectionTest.java
+++ b/src/test/java/fr/adrienbrault/idea/symfony2plugin/tests/config/yaml/inspection/YamlDuplicateServiceKeyInspectionTest.java
@@ -16,7 +16,7 @@ public void testDuplicateServiceKeyProvidesWarning() {
                 "    car: car\n" +
                 "  foo: \n" +
                 "    car: car \n",
-            "Duplicate key"
+            "Symfony: Duplicate key"
         );
 
         assertLocalInspectionContains("routing.yml", "" +
@@ -25,7 +25,16 @@ public void testDuplicateServiceKeyProvidesWarning() {
                 "    car: car \n" +
                 "  f<caret>oo: \n" +
                 "    car: car",
-            "Duplicate key"
+            "Symfony: Duplicate key"
+        );
+
+        assertLocalInspectionNotContains("routing.yml", "" +
+                "services:\n" +
+                "  foo1: \n" +
+                "    car: car \n" +
+                "  f<caret>oo: \n" +
+                "    car: car",
+            "Symfony: Duplicate key"
         );
     }