diff --git a/Makefile.in b/Makefile.in
index 4a6bf95..1d80284 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -20,7 +20,8 @@
 CC=@CC@
 LD=@LD@
 PATHS=-DETCDIR=\"$(sysconfdir)\" -DSSH_PROGRAM=\"$(SSH_PROGRAM)\" -DSSH_ASKPASS_DEFAULT=\"$(ASKPASS_PROGRAM)\"
-CFLAGS=@CFLAGS@ $(PATHS) @DEFS@
+CFLAGS=@CFLAGS@
+CPPFLAGS=@CPPFLAGS@ -I. -I$(srcdir) $(PATHS) @DEFS@
 LIBS=@LIBS@
 AR=@AR@
 RANLIB=@RANLIB@