diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3da5b2f63..ecda50655 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,6 +23,7 @@ set( VERSION "R14" )
 include( FindPkgConfig )
 include( CheckIncludeFile )
 include( CheckCSourceRuns )
+include( CheckCXXSourceRuns )
 include( CheckCXXSourceCompiles )
 include( CheckLibraryExists )
 include( CheckFunctionExists )
diff --git a/khotkeys/CMakeLists.txt b/khotkeys/CMakeLists.txt
index b2529ae04..39c84111e 100644
--- a/khotkeys/CMakeLists.txt
+++ b/khotkeys/CMakeLists.txt
@@ -9,7 +9,7 @@
 #
 #################################################
 
-check_c_source_runs( "
+check_cxx_source_runs( "
   class A { public: virtual A* me(); };
   class X { public: int x; virtual void ff() {}; };
   class B : public X, public A { public: virtual B* me(); };