diff --git a/config.h.cmake b/config.h.cmake
index 80ca72920..b72b2f8d5 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -48,8 +48,8 @@
 #cmakedefine HAVE_ENCHANT_GET_VERSION
 #cmakedefine HAVE_GUILE_GMP_MEMORY_FUNCTIONS
 
-#cmakedefine CMAKE_BUILD_TYPE "@CMAKE_BUILD_TYPE@"
-#cmakedefine CMAKE_INSTALL_PREFIX "@CMAKE_INSTALL_PREFIX@"
+#define CMAKE_BUILD_TYPE "@CMAKE_BUILD_TYPE@"
+#define CMAKE_INSTALL_PREFIX "@CMAKE_INSTALL_PREFIX@"
 
 #define PACKAGE_VERSION "@VERSION@"
 #define PACKAGE "@PROJECT_NAME@"