diff --git a/es-core/src/utils/MathUtil.cpp b/es-core/src/utils/MathUtil.cpp
index 53fee584a..cb53762e7 100644
--- a/es-core/src/utils/MathUtil.cpp
+++ b/es-core/src/utils/MathUtil.cpp
@@ -135,7 +135,7 @@ namespace Utils
             // Convert to hex string.
             char buf[33];
             for (int i = 0; i < 16; ++i)
-                sprintf(buf + i * 2, "%02x", digest[i]);
+                snprintf(buf + i * 2, 16, "%02x", digest[i]);
             buf[32] = 0;
 
             return std::string(buf);