diff --git a/source/sw/src/interp.cpp b/source/sw/src/interp.cpp
index c213386d2..2fdec8956 100644
--- a/source/sw/src/interp.cpp
+++ b/source/sw/src/interp.cpp
@@ -111,12 +111,4 @@ void restoreinterpolations(void)                 // Stick at end of drawscreen
         *curipos[i] = bakipos[i];
 }
 
-void togglespriteinterpolation(spritetype *sp, int set)
-{
-    auto func = set ? setinterpolation : stopinterpolation;
-    func(&sp->x);
-    func(&sp->y);
-    func(&sp->z);
-}
-
 END_SW_NS
diff --git a/source/sw/src/interp.h b/source/sw/src/interp.h
index 8ac33a8d4..aa44fec8e 100644
--- a/source/sw/src/interp.h
+++ b/source/sw/src/interp.h
@@ -50,11 +50,6 @@ void updateinterpolations(void);
 void dointerpolations(int smoothratio);
 void restoreinterpolations(void);
 
-void togglespriteinterpolation(spritetype *sp, int set);
-
-static void FORCE_INLINE setspriteinterpolation(spritetype *sp) { togglespriteinterpolation(sp, 1); }
-static void FORCE_INLINE stopspriteinterpolation(spritetype *sp) { togglespriteinterpolation(sp, 0); }
-
 #endif
 
 END_SW_NS