diff --git a/src/tools/chdman.cpp b/src/tools/chdman.cpp
index 6029f481e07..75a1b20147b 100644
--- a/src/tools/chdman.cpp
+++ b/src/tools/chdman.cpp
@@ -36,6 +36,8 @@
 /* MINGW has adopted the MSVC formatting for 64-bit ints as of gcc 4.4 */
 #if defined(__MINGW32__) || defined(_MSC_VER)
 #define I64FMT   "I64"
+#elif defined(__linux__) && defined(__LP64__)
+#define I64FMT   "l"
 #else
 #define I64FMT   "ll"
 #endif