diff --git a/Common/OS.cpp b/Common/OS.cpp
index 380fb481f09ea706672487df87a1cbd58ee688aa..20864175a91a3750c1b9c0753b487b53fe808168 100644
--- a/Common/OS.cpp
+++ b/Common/OS.cpp
@@ -187,7 +187,7 @@ const char *GetEnvironmentVar(const char *var)
 #endif
 }
 
-const void SetEnvironmentVar(const char *var, const char *val)
+void SetEnvironmentVar(const char *var, const char *val)
 {
 #if defined(WIN32) && !defined(__CYGWIN__)
   // should probably use Unicode version here