diff --git a/lasso.pc.in b/lasso.pc.in
index 0efed0f2..6cfc4a4b 100644
--- a/lasso.pc.in
+++ b/lasso.pc.in
@@ -7,5 +7,5 @@ Name: lasso
 Version: @VERSION@
 Description: A free implementation of the Liberty Alliance specifications
 Requires: libxml-2.0 libxslt xmlsec1 glib-2.0 gobject-2.0
-Cflags: @LASSO_PUB_CFLAGS@
+Cflags: -I${includedir} @LASSO_PUB_CFLAGS@
 Libs: -L${libdir} @LASSO_CORE_LIBS@