diff --git a/src/hb-subset-glyf.cc b/src/hb-subset-glyf.cc
index 4d11100..1bbcbdc 100644
--- a/src/hb-subset-glyf.cc
+++ b/src/hb-subset-glyf.cc
@@ -45,7 +45,7 @@
     hb_codepoint_t next_glyph = glyph_ids[i];
     if (!instruction_ranges->resize (instruction_ranges->len + 2))
     {
-      DEBUG_MSG(SUBSET, nullptr, "Failed to resize instruction_ranges.", next_glyph);
+      DEBUG_MSG(SUBSET, nullptr, "Failed to resize instruction_ranges.");
       return false;
     }
     unsigned int *instruction_start = &(*instruction_ranges)[instruction_ranges->len - 2];