diff --git a/clang/include/clang/AST/StmtOpenMP.h b/clang/include/clang/AST/StmtOpenMP.h
index 2725747e051e7..6216433915357 100644
--- a/clang/include/clang/AST/StmtOpenMP.h
+++ b/clang/include/clang/AST/StmtOpenMP.h
@@ -994,7 +994,7 @@ class OMPLoopTransformationDirective : public OMPLoopBasedDirective {
   unsigned getNumAssociatedLoops() const { return getLoopsNumber(); }
 
   /// Return the number of loops generated by this loop transformation.
-  unsigned getNumGeneratedLoops() { return NumGeneratedLoops; }
+  unsigned getNumGeneratedLoops() const { return NumGeneratedLoops; }
 
   /// Get the de-sugared statements after the loop transformation.
   ///