diff --git a/Main/GNUmakefile.preamble b/Main/GNUmakefile.preamble
index 9938d4af2..6d8c1dc96 100644
--- a/Main/GNUmakefile.preamble
+++ b/Main/GNUmakefile.preamble
@@ -7,7 +7,7 @@ ADDITIONAL_CPPFLAGS += \
 
 ADDITIONAL_INCLUDE_DIRS += \
 	-I../SoObjects/	\
-	-I../..
+	-I..
 
 ADDITIONAL_LIB_DIRS += \
 	-L../SoObjects/SOGo/$(GNUSTEP_OBJ_DIR)/ \