diff --git a/src/core/dhcp/nm-dhcp-utils.c b/src/core/dhcp/nm-dhcp-utils.c
index c3cbe610b1..77b500be05 100644
--- a/src/core/dhcp/nm-dhcp-utils.c
+++ b/src/core/dhcp/nm-dhcp-utils.c
@@ -989,7 +989,7 @@ lease_option_print_label(NMStrBuf *sbuf, size_t n_label, const uint8_t **datap,
             break;
         case '.':
         case '\\':
-            nm_str_buf_append_c2(sbuf, '\\', c);
+            nm_str_buf_append_c(sbuf, '\\', c);
             break;
         default:
             nm_str_buf_append_printf(sbuf, "\\%3d", c);
diff --git a/src/libnm-glib-aux/nm-shared-utils.c b/src/libnm-glib-aux/nm-shared-utils.c
index 021893f86a..cf9ba6f993 100644
--- a/src/libnm-glib-aux/nm-shared-utils.c
+++ b/src/libnm-glib-aux/nm-shared-utils.c
@@ -2708,11 +2708,11 @@ nm_g_type_find_implementing_class_for_property(GType gtype, const char *pname)
 static void
 _str_buf_append_c_escape_octal(NMStrBuf *strbuf, char ch)
 {
-    nm_str_buf_append_c4(strbuf,
-                         '\\',
-                         '0' + ((char) ((((guchar) ch) >> 6) & 07)),
-                         '0' + ((char) ((((guchar) ch) >> 3) & 07)),
-                         '0' + ((char) ((((guchar) ch)) & 07)));
+    nm_str_buf_append_c(strbuf,
+                        '\\',
+                        '0' + ((char) ((((guchar) ch) >> 6) & 07)),
+                        '0' + ((char) ((((guchar) ch) >> 3) & 07)),
+                        '0' + ((char) ((((guchar) ch)) & 07)));
 }
 
 /**
@@ -2962,7 +2962,7 @@ nm_utils_buf_utf8safe_escape(gconstpointer           buf,
 
             nm_assert(ch);
             if (ch == '\\')
-                nm_str_buf_append_c2(&strbuf, '\\', '\\');
+                nm_str_buf_append_c(&strbuf, '\\', '\\');
             else if ((NM_FLAGS_HAS(flags, NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_CTRL) && ch < ' ')
                      || (NM_FLAGS_HAS(flags, NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_NON_ASCII)
                          && ((guchar) ch) >= 127))
diff --git a/src/libnm-glib-aux/nm-str-buf.h b/src/libnm-glib-aux/nm-str-buf.h
index 8f226dac57..f6661e3b7f 100644
--- a/src/libnm-glib-aux/nm-str-buf.h
+++ b/src/libnm-glib-aux/nm-str-buf.h
@@ -199,9 +199,6 @@ _nm_str_buf_append_c_1(NMStrBuf *strbuf, char ch)
 #define nm_str_buf_append_c(strbuf, ...) \
     _nm_str_buf_append_c_n1((strbuf), NM_NARG(__VA_ARGS__), __VA_ARGS__)
 
-#define nm_str_buf_append_c2(strbuf, ...) nm_str_buf_append_c(strbuf, __VA_ARGS__)
-#define nm_str_buf_append_c4(strbuf, ...) nm_str_buf_append_c(strbuf, __VA_ARGS__)
-
 static inline void
 nm_str_buf_append_c_hex(NMStrBuf *strbuf, char ch, gboolean upper_case)
 {