diff --git a/python/src/com/jetbrains/python/inspections/PyDictDuplicateKeysInspection.java b/python/src/com/jetbrains/python/inspections/PyDictDuplicateKeysInspection.java
index f2dea24b49a5..6d84684438a5 100644
--- a/python/src/com/jetbrains/python/inspections/PyDictDuplicateKeysInspection.java
+++ b/python/src/com/jetbrains/python/inspections/PyDictDuplicateKeysInspection.java
@@ -20,6 +20,7 @@ import com.intellij.codeInspection.LocalQuickFix;
 import com.intellij.codeInspection.ProblemsHolder;
 import com.intellij.lang.ASTNode;
 import com.intellij.openapi.util.Pair;
+import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiElementVisitor;
 import com.intellij.util.containers.MultiMap;
@@ -115,7 +116,7 @@ public class PyDictDuplicateKeysInspection extends PyInspection {
     @Nullable
     private String getKeyValue(@NotNull PsiElement node) {
       if (node instanceof PyStringLiteralExpression) {
-        return ((PyStringLiteralExpression)node).getStringValue();
+        return wrapStringKey(((PyStringLiteralExpression)node).getStringValue());
       }
 
       if (node instanceof PyNumericLiteralExpression) {
@@ -139,7 +140,7 @@ public class PyDictDuplicateKeysInspection extends PyInspection {
 
         if (keys.size() > 1) {
           for (PsiElement key : keys) {
-            registerProblem(key, "Dictionary contains duplicate keys '" + keyValue + "'", quickFixes);
+            registerProblem(key, "Dictionary contains duplicate keys '" + unwrapStringKey(keyValue) + "'", quickFixes);
           }
         }
       }
@@ -162,7 +163,7 @@ public class PyDictDuplicateKeysInspection extends PyInspection {
         final ASTNode node = ((PyKeywordArgument)argument).getKeywordNode();
         final String keyValue = ((PyKeywordArgument)argument).getKeyword();
         if (node != null && keyValue != null) {
-          return Pair.createNonNull(node.getPsi(), keyValue);
+          return Pair.createNonNull(node.getPsi(), wrapStringKey(keyValue));
         }
       }
 
@@ -173,5 +174,15 @@ public class PyDictDuplicateKeysInspection extends PyInspection {
       final PyExpression callee = expression.getCallee();
       return callee != null && "dict".equals(callee.getText());
     }
+
+    @NotNull
+    private static String wrapStringKey(@NotNull String key) {
+      return "'" + key + "'";
+    }
+
+    @NotNull
+    private static String unwrapStringKey(@NotNull String key) {
+      return StringUtil.unquoteString(key, '\'');
+    }
   }
 }
diff --git a/python/testData/inspections/PyDictDuplicateKeysInspection/test.py b/python/testData/inspections/PyDictDuplicateKeysInspection/test.py
index 7b920828d6af..95b3e5acaf6f 100644
--- a/python/testData/inspections/PyDictDuplicateKeysInspection/test.py
+++ b/python/testData/inspections/PyDictDuplicateKeysInspection/test.py
@@ -39,4 +39,10 @@ d = {<warning descr="Dictionary contains duplicate keys '0'">0j</warning>: 1, <w
     <warning descr="Dictionary contains duplicate keys 'a'">'a'</warning>: 1,
     <warning descr="Dictionary contains duplicate keys 'a'">'a'</warning>: 2,
     <warning descr="Dictionary contains duplicate keys 'a'">'a'</warning>: 3,
+}
+
+# PY-30423
+a = {
+    1: 2,
+    '1': 2,
 }
\ No newline at end of file