diff --git a/python/python-psi-impl/src/com/jetbrains/python/codeInsight/signatureHelp/PySignatureHelpProvider.java b/python/python-psi-impl/src/com/jetbrains/python/codeInsight/signatureHelp/PySignatureHelpProvider.java
index 2b5919c005fd..a40f70e224ec 100644
--- a/python/python-psi-impl/src/com/jetbrains/python/codeInsight/signatureHelp/PySignatureHelpProvider.java
+++ b/python/python-psi-impl/src/com/jetbrains/python/codeInsight/signatureHelp/PySignatureHelpProvider.java
@@ -24,7 +24,7 @@ public final class PySignatureHelpProvider implements SignatureHelpProvider {
   @Override
   public SignatureHelpResult getSignatureHelp(PsiFile file, int offset) {
     PyArgumentList argumentList = PyParameterInfoUtils.findArgumentList(file, offset, -1);
-    if (argumentList == null) {
+    if (argumentList == null || !argumentList.getTextRange().contains(offset)) {
       return null;
     }