diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 32d3b7615..95b13ca69 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -193,8 +193,10 @@ IF(DYNAMIC_OPENSCENEGRAPH)
         ADD_SUBDIRECTORY(osgviewerFOX)
     ENDIF(FOX_FOUND)
 
-    IF   (wxWidgets_FOUND AND (${CMAKE_BUILD_TYPE} STREQUAL "Release"))
-        ADD_SUBDIRECTORY(osgviewerWX)
+    IF   (wxWidgets_FOUND AND CMAKE_BUILD_TYPE)
+        IF (${CMAKE_BUILD_TYPE} STREQUAL "Release")
+            ADD_SUBDIRECTORY(osgviewerWX)
+        ENDIF()
     ENDIF()
 
     IF   (QT_FOUND AND NOT OSG_GLES1_AVAILABLE AND NOT OSG_GLES2_AVAILABLE AND NOT OSG_GL3_AVAILABLE)