diff --git a/src/libipsec/Makefile.am b/src/libipsec/Makefile.am
index a35aba2e5..1044af367 100644
--- a/src/libipsec/Makefile.am
+++ b/src/libipsec/Makefile.am
@@ -23,6 +23,9 @@ endif
 AM_CPPFLAGS = \
 	-I$(top_srcdir)/src/libstrongswan
 
+AM_CFLAGS = \
+	@COVERAGE_CFLAGS@
+
 AM_LDFLAGS = \
 	-no-undefined