diff --git a/pc/thorvg.pc.in b/pc/thorvg.pc.in
index 53235fe3..3ce4414b 100644
--- a/pc/thorvg.pc.in
+++ b/pc/thorvg.pc.in
@@ -8,3 +8,4 @@ Version: @VERSION@
 Requires:
 Libs: -L${libdir} -lthorvg
 Cflags: -I${includedir}/thorvg
+Cflags.private: -DTHORVG_STATIC