diff --git a/src/r_draw.cpp b/src/r_draw.cpp
index aed4bbeea..ccaa864e6 100644
--- a/src/r_draw.cpp
+++ b/src/r_draw.cpp
@@ -3036,8 +3036,8 @@ DWORD (*doprevline1)() = vlinec1;
 
 #ifdef X64_ASM
 extern "C" void vlinetallasm4();
-#define dovline4 vlinetallasm4
 extern "C" void setupvlinetallasm (int);
+void (*dovline4)() = vlinetallasm4;
 #else
 static void vlinec4 ();
 void (*dovline4)() = vlinec4;
diff --git a/src/r_draw.h b/src/r_draw.h
index 27a985dcb..2eefff9bd 100644
--- a/src/r_draw.h
+++ b/src/r_draw.h
@@ -71,12 +71,7 @@ extern void (*R_DrawColumn)(void);
 
 extern DWORD (*dovline1) ();
 extern DWORD (*doprevline1) ();
-#ifdef X64_ASM
-#define dovline4 vlinetallasm4
-extern "C" void vlinetallasm4();
-#else
 extern void (*dovline4) ();
-#endif
 extern void setupvline (int);
 
 extern DWORD (*domvline1) ();