diff --git a/src/base/ftsynth.c b/src/base/ftsynth.c
index 1bf746da7..e82747be9 100644
--- a/src/base/ftsynth.c
+++ b/src/base/ftsynth.c
@@ -18,6 +18,7 @@
 
 #include <ft2build.h>
 #include FT_INTERNAL_OBJECTS_H
+#include FT_INTERNAL_CALC_H
 #include FT_OUTLINE_H
 #include FT_SYNTHESIS_H
 
@@ -74,8 +75,6 @@
 
 #ifdef FT_CONFIG_OPTION_OLD_CALCS
 
-#include <freetype/internal/ftcalc.h>
-
   static FT_Pos
   ft_norm( FT_Vector*  vec )
   {