diff --git a/src/com/google/javascript/jscomp/DeadAssignmentsElimination.java b/src/com/google/javascript/jscomp/DeadAssignmentsElimination.java
index eeadbc697d7..9e930a27a26 100644
--- a/src/com/google/javascript/jscomp/DeadAssignmentsElimination.java
+++ b/src/com/google/javascript/jscomp/DeadAssignmentsElimination.java
@@ -236,7 +236,7 @@ private void tryRemoveAssignment(NodeTraversal t, Node n, Node exprRoot,
       String name = lhs.getString();
       checkState(t.getScope().isFunctionBlockScope());
       Scope functionBlockScope = t.getScope();
-      if (!functionBlockScope.isDeclaredSloppy(name, false)) {
+      if (!functionBlockScope.isDeclaredInFunctionBlockOrParameter(name)) {
         return;
       }
       Var var = functionBlockScope.getVar(name);
diff --git a/src/com/google/javascript/jscomp/Es6RenameReferences.java b/src/com/google/javascript/jscomp/Es6RenameReferences.java
index faa5797d0a5..1b99730246a 100644
--- a/src/com/google/javascript/jscomp/Es6RenameReferences.java
+++ b/src/com/google/javascript/jscomp/Es6RenameReferences.java
@@ -64,7 +64,7 @@ private void renameReference(NodeTraversal t, Node n) {
         n.setString(newName);
         t.reportCodeChange();
         return;
-      } else if (current.isDeclaredSloppy(oldName, false)) {
+      } else if (current.isDeclared(oldName, false)) {
         return;
       } else {
         current = current.getParent();
diff --git a/src/com/google/javascript/jscomp/LiveVariablesAnalysis.java b/src/com/google/javascript/jscomp/LiveVariablesAnalysis.java
index 9815a0814ec..aa44d0897a1 100644
--- a/src/com/google/javascript/jscomp/LiveVariablesAnalysis.java
+++ b/src/com/google/javascript/jscomp/LiveVariablesAnalysis.java
@@ -279,7 +279,7 @@ private void computeGenKill(Node n, BitSet gen, BitSet kill,
   private void addToSetIfLocal(Node node, BitSet set) {
     checkState(node.isName());
     String name = node.getString();
-    if (!jsScope.isDeclaredSloppy(name, false)) {
+    if (!jsScope.isDeclared(name, false)) {
       return;
     }
     Var var = jsScope.getVar(name);
@@ -301,6 +301,6 @@ void markAllParametersEscaped() {
 
   private boolean isArgumentsName(Node n) {
     return n.isName() && n.getString().equals(ARGUMENT_ARRAY_ALIAS)
-        && !jsScope.isDeclaredSloppy(ARGUMENT_ARRAY_ALIAS, false);
+        && !jsScope.isDeclared(ARGUMENT_ARRAY_ALIAS, false);
   }
 }
diff --git a/src/com/google/javascript/jscomp/LiveVariablesAnalysisEs6.java b/src/com/google/javascript/jscomp/LiveVariablesAnalysisEs6.java
index e31ba48dbca..33d8319c717 100644
--- a/src/com/google/javascript/jscomp/LiveVariablesAnalysisEs6.java
+++ b/src/com/google/javascript/jscomp/LiveVariablesAnalysisEs6.java
@@ -334,10 +334,16 @@ private void computeGenKill(Node n, BitSet gen, BitSet kill, boolean conditional
   private void addToSetIfLocal(Node node, BitSet set) {
     checkState(node.isName(), node);
     String name = node.getString();
+    boolean local;
 
     // add to the local set if the variable is declared in the function or function body because
     // ES6 separates the scope but hoists variables to the function scope
-    if (jsScope.isDeclaredSloppy(name, false)) {
+    if (jsScope.isFunctionBlockScope()) {
+      local = jsScope.isDeclaredInFunctionBlockOrParameter(name);
+    } else {
+      local = jsScope.isDeclared(name, false);
+    }
+    if (local) {
       Var var = jsScope.getVar(name);
       if (!escaped.contains(var)) {
         set.set(getVarIndex(var.getName()));
@@ -383,6 +389,6 @@ private boolean isArgumentsName(Node n) {
     }
     return n.isName()
         && n.getString().equals(ARGUMENT_ARRAY_ALIAS)
-        && (!jsScope.isDeclaredSloppy(ARGUMENT_ARRAY_ALIAS, false) || !childDeclared);
+        && (!jsScope.isDeclared(ARGUMENT_ARRAY_ALIAS, false) || !childDeclared);
   }
 }
diff --git a/src/com/google/javascript/jscomp/Scope.java b/src/com/google/javascript/jscomp/Scope.java
index 612a9b1e564..48c6df1e150 100644
--- a/src/com/google/javascript/jscomp/Scope.java
+++ b/src/com/google/javascript/jscomp/Scope.java
@@ -188,22 +188,15 @@ public Var getArgumentsVar() {
   }
 
   /**
-   * @deprecated use #isDeclared instead
+   * Use only when in a function block scope and want to tell if a name is either at the top of the
+   * function block scope or the function parameter scope
    */
-  @Deprecated
-  public boolean isDeclaredSloppy(String name, boolean recurse) {
+  public boolean isDeclaredInFunctionBlockOrParameter(String name) {
     // In ES6, we create a separate "function parameter scope" above the function block scope to
     // handle default parameters. Since nothing in the function block scope is allowed to shadow
     // the variables in the function scope, we treat the two scopes as one in this method.
-    checkState(recurse == false);
-    if (!isDeclared(name, false)) {
-      if (parent != null && isFunctionBlockScope()) {
-        return parent.isDeclared(name, false);
-      }
-      return false;
-    } else {
-      return true;
-    }
+    checkState(isFunctionBlockScope());
+    return isDeclared(name, false) || parent.isDeclared(name, false);
   }
 
   /**
diff --git a/src/com/google/javascript/jscomp/TypedScope.java b/src/com/google/javascript/jscomp/TypedScope.java
index 4a645edb821..ab6cce4e6dd 100644
--- a/src/com/google/javascript/jscomp/TypedScope.java
+++ b/src/com/google/javascript/jscomp/TypedScope.java
@@ -201,13 +201,10 @@ public Var getArgumentsVar() {
     throw new IllegalStateException("Method getArgumentsVar cannot be called on typed scopes.");
   }
 
-  /**
-   * @deprecated use #isDeclared instead
-   */
-  @Deprecated
   @Override
-  public boolean isDeclaredSloppy(String name, boolean recurse) {
-    return isDeclared(name, false);
+  public boolean isDeclaredInFunctionBlockOrParameter(String name) {
+    throw new IllegalStateException(
+        "Method isDeclaredInFunctionBlockOrParameter cannot be called on typed scopes.");
   }
 
   @Override
diff --git a/test/com/google/javascript/jscomp/Es6SyntacticScopeCreatorTest.java b/test/com/google/javascript/jscomp/Es6SyntacticScopeCreatorTest.java
index bba3fa43e0d..4a796f51d2e 100644
--- a/test/com/google/javascript/jscomp/Es6SyntacticScopeCreatorTest.java
+++ b/test/com/google/javascript/jscomp/Es6SyntacticScopeCreatorTest.java
@@ -557,7 +557,7 @@ public void testFunctionArgument() {
     Scope fBlockScope = scopeCreator.createScope(functionBlock, functionScope);
 
     assertFalse(fBlockScope.isDeclared("x", false));
-    assertTrue(fBlockScope.isDeclaredSloppy("x", false));
+    assertTrue(fBlockScope.isDeclaredInFunctionBlockOrParameter("x"));
     assertFalse(fBlockScope.isDeclared("y", false));
 
     Node ifBlock = functionBlock.getLastChild().getLastChild();
@@ -699,7 +699,7 @@ public void testSimpleFunctionParam() {
     Node fBlock = NodeUtil.getFunctionBody(fNode);
     Scope fBlockScope = scopeCreator.createScope(fBlock, fScope);
     assertFalse(fBlockScope.isDeclared("x", false));
-    assertTrue(fBlockScope.isDeclaredSloppy("x", false));
+    assertTrue(fBlockScope.isDeclaredInFunctionBlockOrParameter("x"));
   }
 
   public void testOnlyOneDeclaration() {
@@ -713,7 +713,7 @@ public void testOnlyOneDeclaration() {
     Node fBlock = fNode.getLastChild();
     Scope fBlockScope = scopeCreator.createScope(fBlock, fScope);
     assertFalse(fBlockScope.isDeclared("x", false));
-    assertTrue(fBlockScope.isDeclaredSloppy("x", false));
+    assertTrue(fBlockScope.isDeclaredInFunctionBlockOrParameter("x"));
 
     Node ifBlock = fBlock.getFirstChild().getLastChild();
     Scope ifBlockScope = scopeCreator.createScope(ifBlock, fBlockScope);