diff --git a/src/com/google/javascript/jscomp/Compiler.java b/src/com/google/javascript/jscomp/Compiler.java
index 945f7e7c8dd..ab65f624d6e 100644
--- a/src/com/google/javascript/jscomp/Compiler.java
+++ b/src/com/google/javascript/jscomp/Compiler.java
@@ -384,7 +384,7 @@ protected void reconcileOptionsWithGuards() {
     // But we do not want to see the warnings from OTI.
     if (options.getNewTypeInference()) {
       options.checkTypes = true;
-      // Supress warnings from the const checks of CheckAccessControls so as to avoid
+      // Suppress warnings from the const checks of CheckAccessControls so as to avoid
       // duplication.
       options.setWarningLevel(DiagnosticGroups.ACCESS_CONTROLS_CONST, CheckLevel.OFF);
       if (!options.reportOTIErrorsUnderNTI) {
diff --git a/src/com/google/javascript/rhino/JSDocInfoBuilder.java b/src/com/google/javascript/rhino/JSDocInfoBuilder.java
index 12666d66078..aaea006f37f 100644
--- a/src/com/google/javascript/rhino/JSDocInfoBuilder.java
+++ b/src/com/google/javascript/rhino/JSDocInfoBuilder.java
@@ -41,6 +41,7 @@
 
 import com.google.common.base.Preconditions;
 import com.google.javascript.rhino.JSDocInfo.Visibility;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 import javax.annotation.Nullable;
@@ -66,6 +67,9 @@ public final class JSDocInfoBuilder {
   // the current marker, if any.
   private JSDocInfo.Marker currentMarker;
 
+  // the set of unique license texts
+  private final Set<String> licenseTexts;
+
   public JSDocInfoBuilder(boolean parseDocumentation) {
     this(new JSDocInfo(parseDocumentation), parseDocumentation, false);
   }
@@ -75,6 +79,7 @@ private JSDocInfoBuilder(
     this.currentInfo = info;
     this.parseDocumentation = parseDocumentation;
     this.populated = populated;
+    this.licenseTexts = new HashSet<>();
   }
 
   public static JSDocInfoBuilder copyFrom(JSDocInfo info) {
@@ -814,10 +819,15 @@ public boolean recordLicense(String license) {
   }
 
   public boolean addLicense(String license) {
+    if (!licenseTexts.add(license)) {
+      return false;
+    }
+
     String txt = currentInfo.getLicense();
     if (txt == null) {
       txt = "";
     }
+
     currentInfo.setLicense(txt + license);
     populated = true;
     return true;
diff --git a/test/com/google/javascript/jscomp/CompilerTest.java b/test/com/google/javascript/jscomp/CompilerTest.java
index b9402b8fc36..5a4d4b9590d 100644
--- a/test/com/google/javascript/jscomp/CompilerTest.java
+++ b/test/com/google/javascript/jscomp/CompilerTest.java
@@ -492,7 +492,7 @@ public void testMultipleUniqueImportantComments() throws Exception {
     assertEquals(expected, compiler.toSource());
   }
 
-  public void testMultipleIndenticalImportantComments() throws Exception {
+  public void testMultipleIdenticalImportantComments() throws Exception {
     String js1 = "/*! Identical license here */\n" + "var x;";
     String js2 = "/*! Identical license here */\n" + "var y;";
     String expected = "/*\n Identical license here */\n";
@@ -618,25 +618,29 @@ public void testMultipleUniqueLicenses() throws Exception {
     assertEquals(expected, compiler.toSource());
   }
 
-  public void testMultipleIndenticalLicenses() throws Exception {
+  public void testMultipleIdenticalLicenses() throws Exception {
     String js1 = "/** @license Identical license here */\n"
                  + "var x;";
     String js2 = "/** @license Identical license here */\n"
                  + "var y;";
+    String js3 = "/** @license Identical license here */\n"
+                 + "var z;\n"
+                 + "/** @license Identical license here */";
     String expected = "/*\n Identical license here */\n";
 
     Compiler compiler = new Compiler();
     CompilerOptions options = createNewFlagBasedOptions();
     List<SourceFile> inputs = ImmutableList.of(
         SourceFile.fromCode("testcode1", js1),
-        SourceFile.fromCode("testcode2", js2));
+        SourceFile.fromCode("testcode2", js2),
+        SourceFile.fromCode("bundled", js3));
     Result result = compiler.compile(EMPTY_EXTERNS, inputs, options);
 
     assertTrue(Joiner.on(",").join(result.errors), result.success);
     assertEquals(expected, compiler.toSource());
   }
 
-  public void testIndenticalLicenseAndImportantComent() throws Exception {
+  public void testIdenticalLicenseAndImportantComment() throws Exception {
     String js1 = "/** @license Identical license here */\n" + "var x;";
     String js2 = "/*! Identical license here */\n" + "var y;";
     String expected = "/*\n Identical license here */\n";