diff --git a/src/glsl/test.cpp b/src/glsl/test.cpp
index b1ff92e..9dc7c47 100644
--- a/src/glsl/test.cpp
+++ b/src/glsl/test.cpp
@@ -37,6 +37,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include "util/strtod.h"
 
 #include "test_optpass.h"
 
@@ -67,6 +68,9 @@ static const char *extract_command_from_argv(int *argc, char **argv)
 int main(int argc, char **argv)
 {
    const char *command = extract_command_from_argv(&argc, argv);
+
+   _mesa_locale_init();
+
    if (strcmp(command, "optpass") == 0) {
       return test_optpass(argc, argv);
    } else {