diff --git a/src/xpdev/GNUmakefile b/src/xpdev/GNUmakefile
index b20fb5f2ac55fdf07068867d8c5607ce739aa153..715830c3fae9b01ae6ce8710842f6130ca50ca61 100644
--- a/src/xpdev/GNUmakefile
+++ b/src/xpdev/GNUmakefile
@@ -7,7 +7,7 @@ endif
 MTOBJS	+=	$(MTOBJODIR)$(DIRSEP)xpevent$(OFILE)
 
 MT_CFLAGS += -DLINK_LIST_THREADSAFE
-CFLAGS	+=	-DSOUNDCARD_H_IN=$(shell if [ -e /usr/include/sys/soundcard.h ] ; then echo SYS ; elif [ -e /usr/include/soundcard.h ] ; then echo INCLUDE ; elif [ -e /usr/include/linux/soundcard.h ] ; then echo LINUX ; else echo NONE ; fi)
+CFLAGS	+=	-DSOUNDCARD_H_IN=$(shell if [ -e /usr/include/sys/soundcard.h ] ; then echo SYS ; elif [ -e /usr/include/soundcard.h ] ; then echo INCLUDE ; elif [ -e /usr/include/linux/soundcard.h ] ; then echo LINUX ; else echo NONE ; fi) -I.
 
 # Executable Build Rule
 $(WRAPTEST): $(OBJODIR)/wraptest.o $(DEPS)