diff --git a/hw/xbox/nv2a/pgraph/glsl/vsh-prog.c b/hw/xbox/nv2a/pgraph/glsl/vsh-prog.c
index 7bebed71e8..650d95854c 100644
--- a/hw/xbox/nv2a/pgraph/glsl/vsh-prog.c
+++ b/hw/xbox/nv2a/pgraph/glsl/vsh-prog.c
@@ -368,7 +368,7 @@ static MString* decode_opcode_input(const uint32_t *shader_token,
 
 
     if (vsh_get_field(shader_token, neg_field) > 0) {
-        mstring_append_chr(ret_str, '-');
+        mstring_append_fmt(ret_str, "-");
     }
 
     /* PARAM_R uses the supplied reg_num, but the other two need to be
@@ -446,10 +446,9 @@ static MString* decode_opcode(const uint32_t *shader_token,
         bool write_fog_register = false;
         if (vsh_get_field(shader_token, FLD_OUT_ORB) == OUTPUT_C) {
             assert(!"TODO: Emulate writeable const registers");
-            mstring_append(ret, "c");
-            mstring_append_int(ret,
-                convert_c_register(
-                    vsh_get_field(shader_token, FLD_OUT_ADDRESS)));
+            mstring_append_fmt(ret, "c%d",
+                               convert_c_register(vsh_get_field(
+                                   shader_token, FLD_OUT_ADDRESS)));
         } else {
             int out_reg = vsh_get_field(shader_token, FLD_OUT_ADDRESS) & 0xF;
             mstring_append(ret,out_reg_name[out_reg]);
diff --git a/include/qemu/mstring.h b/include/qemu/mstring.h
index 5b96f0edc2..c3e32c181c 100644
--- a/include/qemu/mstring.h
+++ b/include/qemu/mstring.h
@@ -37,18 +37,6 @@ void mstring_append(MString *mstr, const char *str)
    mstr->string = n;
 }
 
-static inline
-void mstring_append_chr(MString *mstr, char chr)
-{
-   mstring_append_fmt(mstr, "%c", chr);
-}
-
-static inline
-void mstring_append_int(MString *mstr, int val)
-{
-   mstring_append_fmt(mstr, "%" PRId64, val);
-}
-
 static inline
 MString *mstring_new(void)
 {