diff --git a/src/libnm-core-intern/nm-meta-setting-base-impl.h b/src/libnm-core-intern/nm-meta-setting-base-impl.h
index 94b14e844..5e05ff31e 100644
--- a/src/libnm-core-intern/nm-meta-setting-base-impl.h
+++ b/src/libnm-core-intern/nm-meta-setting-base-impl.h
@@ -94,7 +94,7 @@ extern const NMSetting8021xSchemeVtable
 
 /*****************************************************************************/
 
-typedef enum {
+typedef enum _nm_packed {
     /* the enum (and their numeric values) are internal API. Do not assign
      * any meaning the numeric values, because they already have one:
      *
diff --git a/src/libnmc-setting/nm-meta-setting-base-impl.h b/src/libnmc-setting/nm-meta-setting-base-impl.h
index 94b14e844..5e05ff31e 100644
--- a/src/libnmc-setting/nm-meta-setting-base-impl.h
+++ b/src/libnmc-setting/nm-meta-setting-base-impl.h
@@ -94,7 +94,7 @@ extern const NMSetting8021xSchemeVtable
 
 /*****************************************************************************/
 
-typedef enum {
+typedef enum _nm_packed {
     /* the enum (and their numeric values) are internal API. Do not assign
      * any meaning the numeric values, because they already have one:
      *