diff --git a/core/descriptors/src/org/jetbrains/kotlin/builtins/KotlinBuiltIns.java b/core/descriptors/src/org/jetbrains/kotlin/builtins/KotlinBuiltIns.java
index b942b394a0f..722a43fc8b4 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/builtins/KotlinBuiltIns.java
+++ b/core/descriptors/src/org/jetbrains/kotlin/builtins/KotlinBuiltIns.java
@@ -376,9 +376,19 @@ public class KotlinBuiltIns {
         return getBuiltInClassByName("Unit");
     }
 
+    @NotNull
+    public static String getFunctionName(int parameterCount) {
+        return "Function" + parameterCount;
+    }
+
+    @NotNull
+    public static String getExtensionFunctionName(int parameterCount) {
+        return getFunctionName(parameterCount + 1);
+    }
+
     @NotNull
     public ClassDescriptor getFunction(int parameterCount) {
-        return getBuiltInClassByName("Function" + parameterCount);
+        return getBuiltInClassByName(getFunctionName(parameterCount));
     }
 
     /**
@@ -388,7 +398,7 @@ public class KotlinBuiltIns {
     @Deprecated
     @NotNull
     public ClassDescriptor getExtensionFunction(int parameterCount) {
-        return getBuiltInClassByName("Function" + (parameterCount + 1));
+        return getBuiltInClassByName(getExtensionFunctionName((parameterCount)));
     }
 
     @NotNull
diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/navigation/MemberMatching.java b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/navigation/MemberMatching.java
index b5f9d4bb01b..c43b25e0726 100644
--- a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/navigation/MemberMatching.java
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/navigation/MemberMatching.java
@@ -32,6 +32,7 @@ import org.jetbrains.kotlin.lexer.JetTokens;
 import org.jetbrains.kotlin.name.Name;
 import org.jetbrains.kotlin.psi.*;
 import org.jetbrains.kotlin.renderer.DescriptorRenderer;
+import org.jetbrains.kotlin.resolve.descriptorUtil.DescriptorUtilsKt;
 import org.jetbrains.kotlin.types.JetType;
 
 import java.util.List;
@@ -73,14 +74,12 @@ public class MemberMatching {
 
             @Override
             public String visitFunctionType(@NotNull JetFunctionType type, Void data) {
-                KotlinBuiltIns builtIns = KotlinBuiltIns.getInstance();
                 int parameterCount = type.getParameters().size();
-
-                if (type.getReceiverTypeReference() == null) {
-                    return builtIns.getFunction(parameterCount).getName().asString();
+                if (type.getReceiverTypeReference() != null) {
+                    return KotlinBuiltIns.getExtensionFunctionName(parameterCount);
                 }
                 else {
-                    return builtIns.getExtensionFunction(parameterCount).getName().asString();
+                    return KotlinBuiltIns.getFunctionName(parameterCount);
                 }
             }
 
@@ -229,8 +228,9 @@ public class MemberMatching {
                 }
             }));
 
+            KotlinBuiltIns builtIns = DescriptorUtilsKt.getBuiltIns(descriptor);
             Set<String> decompiledUpperBounds = decompiledParameterToBounds.get(descriptor.getName()).isEmpty()
-                    ? Sets.newHashSet(DescriptorRenderer.FQ_NAMES_IN_TYPES.renderType(KotlinBuiltIns.getInstance().getDefaultBound()))
+                    ? Sets.newHashSet(DescriptorRenderer.FQ_NAMES_IN_TYPES.renderType(builtIns.getDefaultBound()))
                     : Sets.newHashSet(decompiledParameterToBounds.get(descriptor.getName()));
             if (!descriptorUpperBounds.equals(decompiledUpperBounds)) {
                 return false;