diff --git a/source/build/include/build.h b/source/build/include/build.h
index 2600eaaa7..4577e8e67 100644
--- a/source/build/include/build.h
+++ b/source/build/include/build.h
@@ -29,8 +29,6 @@ typedef int64_t coord_t;
 #include "maptypes.h"
 #include "clip.h"
 
-int32_t getwalldist(vec2_t const in, int const wallnum, vec2_t * const out);
-
 enum {
     ENGINECOMPATIBILITY_NONE = 0,
     ENGINECOMPATIBILITY_19950829, // Powerslave/Exhumed
diff --git a/source/build/src/clip.cpp b/source/build/src/clip.cpp
index ed0facc24..229bbb70a 100644
--- a/source/build/src/clip.cpp
+++ b/source/build/src/clip.cpp
@@ -255,14 +255,6 @@ static inline void keepaway(int32_t *x, int32_t *y, int32_t w)
     while (1);
 }
 
-static int32_t getwalldist(vec2_t const in, int const wallnum)
-{
-    auto dvec = NearestPointOnWall(in.X * maptoworld, in.Y * maptoworld, &wall[wallnum]);
-    vec2_t closest = { int(dvec.X * worldtoint), int(dvec.Y * worldtoint) };
-    return abs(closest.X - in.X) + abs(closest.Y - in.Y);
-}
-
-
 //
 // clipmove
 //