diff --git a/miniz_tinfl.c b/miniz_tinfl.c
index 7a20fe3..f7c8815 100644
--- a/miniz_tinfl.c
+++ b/miniz_tinfl.c
@@ -232,7 +232,7 @@ tinfl_status tinfl_decompress(tinfl_decompressor *r, const mz_uint8 *pIn_buf_nex
         TINFL_GET_BYTE(2, r->m_zhdr1);
         counter = (((r->m_zhdr0 * 256 + r->m_zhdr1) % 31 != 0) || (r->m_zhdr1 & 32) || ((r->m_zhdr0 & 15) != 8));
         if (!(decomp_flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF))
-            counter |= (((1U << (8U + (r->m_zhdr0 >> 4))) > 32768U) || ((out_buf_size_mask + 1) < (size_t)(1U << (8U + (r->m_zhdr0 >> 4)))));
+            counter |= (((1U << (8U + (r->m_zhdr0 >> 4))) > 32768U) || ((out_buf_size_mask + 1) < (size_t)((size_t)1 << (8U + (r->m_zhdr0 >> 4)))));
         if (counter)
         {
             TINFL_CR_RETURN_FOREVER(36, TINFL_STATUS_FAILED);