diff --git a/miniz_tdef.h b/miniz_tdef.h
index ac1e18a..7dc959b 100644
--- a/miniz_tdef.h
+++ b/miniz_tdef.h
@@ -106,7 +106,7 @@ extern "C"
 enum
 {
     TDEFL_LZ_CODE_BUF_SIZE = 64 * 1024,
-    TDEFL_OUT_BUF_SIZE = (TDEFL_LZ_CODE_BUF_SIZE * 13) / 10,
+    TDEFL_OUT_BUF_SIZE = (mz_uint)((TDEFL_LZ_CODE_BUF_SIZE * 13) / 10),
     TDEFL_MAX_HUFF_SYMBOLS = 288,
     TDEFL_LZ_HASH_BITS = 15,
     TDEFL_LEVEL1_HASH_SIZE_MASK = 4095,