diff --git a/libpkgconf/fragment.c b/libpkgconf/fragment.c
index 9a4bc31..f2fd419 100644
--- a/libpkgconf/fragment.c
+++ b/libpkgconf/fragment.c
@@ -34,7 +34,7 @@ struct pkgconf_fragment_check {
 static inline bool
 pkgconf_fragment_is_unmergeable(const char *string)
 {
-	static struct pkgconf_fragment_check check_fragments[] = {
+	static const struct pkgconf_fragment_check check_fragments[] = {
 		{"-framework", 10},
 		{"-isystem", 8},
 		{"-idirafter", 10},
@@ -70,7 +70,7 @@ pkgconf_fragment_is_unmergeable(const char *string)
 static inline bool
 pkgconf_fragment_should_munge(const char *string, const char *sysroot_dir)
 {
-	static struct pkgconf_fragment_check check_fragments[] = {
+	static const struct pkgconf_fragment_check check_fragments[] = {
 		{"-isystem", 8},
 		{"-idirafter", 10},
 		{"-include", 8},