--- a/libmysofa.pc.cmake
+++ b/libmysofa.pc.cmake
@@ -6,6 +6,6 @@
 libdir=@CMAKE_INSTALL_FULL_LIBDIR@
 Libs: -L${libdir} -lmysofa
 Cflags: -I${includedir}
-
+Cflags.private: -DMYSOFA_STATIC_DEFINE=1
 Libs.private: @PKG_CONFIG_PRIVATELIBS@
 #Requires.private:
