diff --git a/src/sfnt/sfwoff2.c b/src/sfnt/sfwoff2.c
index 0a0938d43..b2855b8e7 100644
--- a/src/sfnt/sfwoff2.c
+++ b/src/sfnt/sfwoff2.c
@@ -973,7 +973,7 @@
         /* composite glyph */
         FT_Bool    have_instructions = FALSE;
         FT_UShort  instruction_size  = 0;
-        FT_ULong   composite_size;
+        FT_ULong   composite_size    = 0;
         FT_ULong   size_needed;
         FT_Byte*   pointer           = NULL;