diff --git a/src/settings/plugins/ifcfg-rh/nms-ifcfg-rh-utils.h b/src/settings/plugins/ifcfg-rh/nms-ifcfg-rh-utils.h
index 4aed0dff51..ae0573e115 100644
--- a/src/settings/plugins/ifcfg-rh/nms-ifcfg-rh-utils.h
+++ b/src/settings/plugins/ifcfg-rh/nms-ifcfg-rh-utils.h
@@ -33,7 +33,7 @@ typedef struct {
 	NMSIfcfgKeyTypeFlags key_flags;
 } NMSIfcfgKeyTypeInfo;
 
-const NMSIfcfgKeyTypeInfo nms_ifcfg_well_known_keys[227];
+extern const NMSIfcfgKeyTypeInfo nms_ifcfg_well_known_keys[227];
 
 const NMSIfcfgKeyTypeInfo *nms_ifcfg_well_known_key_find_info (const char *key, gssize *out_idx);