diff --git a/src/Makefile b/src/Makefile
index cdb52068bc..a5b2848f7d 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -27,7 +27,8 @@
 
 srcdir   = .
 CC       = gcc
-INCLPATH = -I.. \
+INCLPATH = -I/usr/include \
+           -I.. \
            -I/usr/X11R6/include \
            -I./../include \
            -I./../lib/ComboBox-1.33 \
diff --git a/src/Makefile.in b/src/Makefile.in
index 4f18509604..6f2481f5ae 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -27,7 +27,8 @@
 srcdir   = @srcdir@
 VPATH    = @srcdir@
 CC       = @CC@
-INCLPATH = -I.. \
+INCLPATH = -I/usr/include \
+           -I.. \
            -I@x_includes@ \
            -I@srcdir@/../include \
            -I@srcdir@/../lib/ComboBox-1.33 \