diff --git a/src/libnm-glib-aux/nm-dedup-multi.h b/src/libnm-glib-aux/nm-dedup-multi.h
index 09b4a11e63..87a2b81583 100644
--- a/src/libnm-glib-aux/nm-dedup-multi.h
+++ b/src/libnm-glib-aux/nm-dedup-multi.h
@@ -37,6 +37,8 @@ typedef enum _NMDedupMultiIdxMode {
 
 /*****************************************************************************/
 
+#define _NMDedupMultiObj_Align (MAX(_nm_alignof(void *), _nm_alignof(gint64)))
+
 struct _NMDedupMultiObj {
     union {
         NMObjBaseInst               parent;
@@ -44,7 +46,7 @@ struct _NMDedupMultiObj {
     };
     NMDedupMultiIndex *_multi_idx;
     guint              _ref_count;
-};
+} _nm_align(_NMDedupMultiObj_Align);
 
 struct _NMDedupMultiObjClass {
     NMObjBaseClass parent;
diff --git a/src/libnm-platform/nmp-object.h b/src/libnm-platform/nmp-object.h
index 5f98deeda4..4901ebcba3 100644
--- a/src/libnm-platform/nmp-object.h
+++ b/src/libnm-platform/nmp-object.h
@@ -427,7 +427,7 @@ struct _NMPObject {
         NMPlatformMptcpAddr mptcp_addr;
         NMPObjectMptcpAddr  _mptcp_addr;
     };
-};
+} _nm_alignas(NMDedupMultiObj);
 
 /*****************************************************************************/