diff --git a/exec/Makefile b/exec/Makefile
index dd99d0ab..8a4a1d48 100644
--- a/exec/Makefile
+++ b/exec/Makefile
@@ -32,6 +32,8 @@
 
 # Include configuration
 #
+srcdir:=$(CURDIR)/../
+
 include $(srcdir)Makefile.inc
 
 override CFLAGS += -I$(srcdir)include