diff --git a/src/gl/scene/gl_clipper.cpp b/src/gl/scene/gl_clipper.cpp
index f82375800a..f21cac6345 100644
--- a/src/gl/scene/gl_clipper.cpp
+++ b/src/gl/scene/gl_clipper.cpp
@@ -38,10 +38,11 @@
 #include "gl/scene/gl_clipper.h"
 #include "g_levellocals.h"
 
+unsigned Clipper::starttime;
 
 Clipper::Clipper()
 {
-	starttime = I_MSTime();
+	starttime++;
 }
 
 //-----------------------------------------------------------------------------
@@ -94,7 +95,7 @@ void Clipper::Clear()
 	
 	cliphead = NULL;
 	silhouette = NULL;
-	starttime = I_MSTime();
+	starttime++;
 }
 
 //-----------------------------------------------------------------------------
diff --git a/src/gl/scene/gl_clipper.h b/src/gl/scene/gl_clipper.h
index 49b1d469f0..c3897bd56f 100644
--- a/src/gl/scene/gl_clipper.h
+++ b/src/gl/scene/gl_clipper.h
@@ -30,7 +30,7 @@ class ClipNode
 
 class Clipper
 {
-	unsigned starttime;
+	static unsigned starttime;
 	FMemArena nodearena;
 	ClipNode * freelist = nullptr;