diff --git a/shared/nm-utils/nm-shared-utils.c b/shared/nm-utils/nm-shared-utils.c
index 9daa7783da..bdd0b077fe 100644
--- a/shared/nm-utils/nm-shared-utils.c
+++ b/shared/nm-utils/nm-shared-utils.c
@@ -2317,3 +2317,26 @@ nm_utils_getpagesize (void)
 
 	return v;
 }
+
+gboolean
+nm_utils_mem_all_zero (gconstpointer data, gsize length)
+{
+	const unsigned char *p = data;
+	int len;
+
+	/* Taken from https://github.com/rustyrussell/ccan/blob/9d2d2c49f053018724bcc6e37029da10b7c3d60d/ccan/mem/mem.c#L92,
+	 * CC-0 licensed. */
+
+	/* Check first 16 bytes manually */
+	for (len = 0; len < 16; len++) {
+		if (!length)
+			return TRUE;
+		if (*p)
+			return FALSE;
+		p++;
+		length--;
+	}
+
+	/* Now we know that's zero, memcmp with self. */
+	return memcmp (data, p, length) == 0;
+}
diff --git a/shared/nm-utils/nm-shared-utils.h b/shared/nm-utils/nm-shared-utils.h
index 37d65e877c..de57418979 100644
--- a/shared/nm-utils/nm-shared-utils.h
+++ b/shared/nm-utils/nm-shared-utils.h
@@ -219,19 +219,7 @@ nm_ip_addr_set (int addr_family, gpointer dst, gconstpointer src)
 
 /*****************************************************************************/
 
-static inline gboolean
-nm_utils_mem_all_zero (gconstpointer mem, gsize len)
-{
-	const guint8 *p;
-
-	for (p = mem; len-- > 0; p++) {
-		if (*p != 0)
-			return FALSE;
-	}
-
-	/* incidentally, a buffer with len==0, is also *all-zero*. */
-	return TRUE;
-}
+gboolean nm_utils_mem_all_zero (gconstpointer data, gsize length);
 
 /*****************************************************************************/