diff --git a/include/freetype/ftmm.h b/include/freetype/ftmm.h
index a85d0be43..35ed039c8 100644
--- a/include/freetype/ftmm.h
+++ b/include/freetype/ftmm.h
@@ -19,6 +19,14 @@
 #ifndef FTMM_H_
 #define FTMM_H_
 
+#include <freetype/freetype.h>
+
+#ifdef FREETYPE_H
+#error "freetype.h of FreeType 1 has been loaded!"
+#error "Please fix the directory search order for header files"
+#error "so that freetype.h of FreeType 2 is found first."
+#endif
+
 
 FT_BEGIN_HEADER