diff --git a/test/api/test-ot-math.c b/test/api/test-ot-math.c
index 4bffcc049..668cc97ec 100644
--- a/test/api/test-ot-math.c
+++ b/test/api/test-ot-math.c
@@ -319,10 +319,9 @@ get_glyph_assembly_italics_correction (hb_font_t *font,
 				       hb_bool_t horizontal)
 {
   hb_position_t corr;
-  unsigned int count = 0;
   hb_ot_math_get_glyph_assembly (font, glyph,
 				 horizontal ? HB_DIRECTION_LTR : HB_DIRECTION_TTB,
-				 0, &count, NULL,
+				 0, NULL, NULL,
 				 &corr);
   return corr;
 }