diff --git a/tools/imatrix/imatrix.cpp b/tools/imatrix/imatrix.cpp
index c125e908b..5e9f911e0 100644
--- a/tools/imatrix/imatrix.cpp
+++ b/tools/imatrix/imatrix.cpp
@@ -10,6 +10,7 @@
 
 #include <chrono>
 #include <climits>
+#include <clocale>
 #include <cmath>
 #include <cstring>
 #include <fstream>