diff --git a/config/OSF1.mk b/config/OSF1.mk
index 4a11d05eb92..8b6e925c02b 100644
--- a/config/OSF1.mk
+++ b/config/OSF1.mk
@@ -27,7 +27,7 @@ ARCH			:= dec
 CPU_ARCH		:= alpha
 GFX_ARCH		:= x
 
-OS_INCLUDES		= -I/usr/include/alpha
+OS_INCLUDES		=
 G++INCLUDES		=
 LOC_LIB_DIR		= /usr/lib/X11
 MOTIF			=