diff --git a/common/interface.cpp b/common/interface.cpp
index 0fe0991..a0d5888 100644
--- a/common/interface.cpp
+++ b/common/interface.cpp
@@ -7,9 +7,11 @@
 
 #include <string.h>
 #include <stdlib.h>
+#include <stdio.h>
 #include "interface.h"
 
 #ifndef _WIN32  // LINUX
+#include <unistd.h>
 #include <dlfcn.h>
 #endif
 
@@ -142,7 +144,7 @@ CreateInterfaceFn Sys_GetFactory( HINTERFACEMODULE hModule )
 	if(!hModule)
 		return NULL;
 
-	return dlsym( (void *)hModule, CREATEINTERFACE_PROCNAME );
+	return (CreateInterfaceFn)dlsym( (void *)hModule, CREATEINTERFACE_PROCNAME );
 }
 
 #endif