diff --git a/src/libcharon/Makefile.am b/src/libcharon/Makefile.am
index 77e2dca0d..550f6eb9c 100644
--- a/src/libcharon/Makefile.am
+++ b/src/libcharon/Makefile.am
@@ -154,6 +154,9 @@ AM_CPPFLAGS = \
 	-DIPSEC_DIR=\"${ipsecdir}\" \
 	-DIPSEC_PIDDIR=\"${piddir}\"
 
+AM_CFLAGS = \
+  @COVERAGE_CFLAGS@
+
 AM_LDFLAGS = \
   -no-undefined
 
diff --git a/src/starter/Makefile.am b/src/starter/Makefile.am
index 787cec41c..873c20ace 100644
--- a/src/starter/Makefile.am
+++ b/src/starter/Makefile.am
@@ -28,6 +28,9 @@ AM_CPPFLAGS = \
 	-DPLUGINS=\""${starter_plugins}\"" \
 	-DDEBUG
 
+AM_CFLAGS = \
+	@COVERAGE_CFLAGS@
+
 AM_YFLAGS = -v -d
 
 starter_LDADD = \