diff --git a/libnm-core/nm-utils.c b/libnm-core/nm-utils.c
index ea4c52c070..5ac4b81a9f 100644
--- a/libnm-core/nm-utils.c
+++ b/libnm-core/nm-utils.c
@@ -2298,7 +2298,7 @@ _nm_utils_parse_tc_handle (const char *str, GError **error)
 
 	nm_assert (str);
 
-	maj = g_ascii_strtoll (str, (char **) &sep, 0x10);
+	maj = nm_g_ascii_strtoll (str, (char **) &sep, 0x10);
 	if (sep == str)
 		goto fail;
 
@@ -2307,7 +2307,7 @@ _nm_utils_parse_tc_handle (const char *str, GError **error)
 	if (sep[0] == ':') {
 		const char *str2 = &sep[1];
 
-		min = g_ascii_strtoll (str2, (char **) &sep, 0x10);
+		min = nm_g_ascii_strtoll (str2, (char **) &sep, 0x10);
 		sep = nm_str_skip_leading_spaces (sep);
 		if (sep[0] != '\0')
 			goto fail;
diff --git a/shared/nm-glib-aux/nm-shared-utils.c b/shared/nm-glib-aux/nm-shared-utils.c
index 550fd9a253..86d9c5a0cf 100644
--- a/shared/nm-glib-aux/nm-shared-utils.c
+++ b/shared/nm-glib-aux/nm-shared-utils.c
@@ -1062,7 +1062,7 @@ _nm_utils_ascii_str_to_int64 (const char *str, guint base, gint64 min, gint64 ma
 	}
 
 	errno = 0;
-	v = g_ascii_strtoll (str, (char **) &s, base);
+	v = nm_g_ascii_strtoll (str, (char **) &s, base);
 
 	if (errno != 0)
 		return fallback;
@@ -1098,7 +1098,7 @@ _nm_utils_ascii_str_to_uint64 (const char *str, guint base, guint64 min, guint64
 	}
 
 	errno = 0;
-	v = g_ascii_strtoull (str, (char **) &s, base);
+	v = nm_g_ascii_strtoull (str, (char **) &s, base);
 
 	if (errno != 0)
 		return fallback;
@@ -1117,8 +1117,8 @@ _nm_utils_ascii_str_to_uint64 (const char *str, guint base, guint64 min, guint64
 
 	if (   v != 0
 	    && str[0] == '-') {
-		/* I don't know why, but g_ascii_strtoull() accepts minus signs ("-2" gives 18446744073709551614).
-		 * For "-0" that is OK, but otherwise not. */
+		/* As documented, g_ascii_strtoull() accepts negative values, and returns their
+		 * absolute value. We don't. */
 		errno = ERANGE;
 		return fallback;
 	}
diff --git a/src/settings/plugins/ifcfg-rh/nms-ifcfg-rh-reader.c b/src/settings/plugins/ifcfg-rh/nms-ifcfg-rh-reader.c
index e619722da3..49a900d41d 100644
--- a/src/settings/plugins/ifcfg-rh/nms-ifcfg-rh-reader.c
+++ b/src/settings/plugins/ifcfg-rh/nms-ifcfg-rh-reader.c
@@ -540,7 +540,7 @@ make_connection_setting (const char *file,
 			char *endptr;
 			double d;
 
-			d = g_ascii_strtod (v, &endptr);
+			d = nm_g_ascii_strtod (v, &endptr);
 			endptr = nm_str_skip_leading_spaces (endptr);
 			if (   errno == 0
 			    && endptr[0] == '\0'