diff --git a/app/define.cpp b/app/define.cpp
index 09b3f25c..882368b3 100644
--- a/app/define.cpp
+++ b/app/define.cpp
@@ -11,4 +11,4 @@ unsigned char g_mousemoved = 0;
 int _DAT_00410050 = 0;
 int _DAT_00410064 = 0;
 int _DAT_004101bc = 200;
-int _last_frame_time = 0;
+long g_lastFrameTime = 0;
diff --git a/app/define.h b/app/define.h
index 45522c2c..4b002051 100644
--- a/app/define.h
+++ b/app/define.h
@@ -12,6 +12,6 @@ extern unsigned char g_mousemoved;
 extern int _DAT_00410050;
 extern int _DAT_00410064;
 extern int _DAT_004101bc;
-extern int _last_frame_time;
+extern long g_lastFrameTime;
 
 #endif // DEFINE_H
diff --git a/app/isle.cpp b/app/isle.cpp
index 053dd78b..fb045fc5 100644
--- a/app/isle.cpp
+++ b/app/isle.cpp
@@ -568,14 +568,14 @@ void Isle::tick(BOOL sleepIfNotNextFrame)
     if (!Timer()) return;
 
     long currentTime = Timer()->GetRealTime();
-    if (currentTime < _last_frame_time) {
-      _last_frame_time = -this->m_frameDelta;
+    if (currentTime < g_lastFrameTime) {
+      g_lastFrameTime = -this->m_frameDelta;
     }
-    if (this->m_frameDelta + _last_frame_time < currentTime) {
+    if (this->m_frameDelta + g_lastFrameTime < currentTime) {
       if (!Lego()->vtable40()) {
         TickleManager()->vtable08();
       }
-      _last_frame_time = currentTime;
+      g_lastFrameTime = currentTime;
 
       if (_DAT_004101bc == 0) {
         return;