diff --git a/Makefile b/Makefile

index 33a4e6b..f49093f 100644

--- a/Makefile

+++ b/Makefile

@@ -121,7 +121,7 @@ install:

 		sed -e "s!@PJ_LDLIBS@!!" | \

 		sed -e "s!@PJ_LDXXLIBS@!$(PJ_LDXXLIBS)!" | \

 		sed -e "s!@PJ_INSTALL_CFLAGS@!!" | \

-		sed -e "s!@PJ_INSTALL_CXXFLAGS@!$(PJ_INSTALL_CXXFLAGS)!" > $(DESTDIR)/$(libdir)/pkgconfig/libpjproject.pc

+		sed -e "s!@PJ_INSTALL_CXXFLAGS@!!" > $(DESTDIR)/$(libdir)/pkgconfig/libpjproject.pc

 uninstall:

 	$(RM) $(DESTDIR)$(libdir)/pkgconfig/libpjproject.pc