diff --git a/libcupsfilters.pc.in b/libcupsfilters.pc.in
index 813e824f..2eeef63b 100644
--- a/libcupsfilters.pc.in
+++ b/libcupsfilters.pc.in
@@ -9,4 +9,4 @@ Version: @VERSION@
 
 Libs: -L${libdir} -lcupsfilters
 Libs.private: @CUPS_LIBS@ @LIBJPEG_LIBS@ @LIBPNG_LIBS@ @LIBTIFF_LIBS@ @LIBQPDF_LIBS@
-Cflags: -I${includedir}/cupsfilters
+Cflags: -I${includedir}/cupsfilters -I${includedir}