diff --git a/src/core/bitmath_func.hpp b/src/core/bitmath_func.hpp
index 01822301e7..4e9a2cd933 100644
--- a/src/core/bitmath_func.hpp
+++ b/src/core/bitmath_func.hpp
@@ -141,18 +141,6 @@ constexpr T ClrBit(T &x, const uint8_t y)
 	return x = (T)(x & ~((T)1U << y));
 }
 
-/**
- * Clears several bits in a variable.
- *
- * This macro clears several bits in a variable. The bits to clear are
- * provided by a value. The new value is also returned.
- *
- * @param x The variable to clear some bits
- * @param y The value with set bits for clearing them in the variable
- * @return The new value of x
- */
-#define CLRBITS(x, y) ((x) &= ~(y))
-
 /**
  * Toggles a bit in a variable.
  *
diff --git a/src/road_cmd.cpp b/src/road_cmd.cpp
index 2d9a6d2de5..35cd09a614 100644
--- a/src/road_cmd.cpp
+++ b/src/road_cmd.cpp
@@ -540,7 +540,7 @@ static CommandCost RemoveRoad(TileIndex tile, DoCommandFlags flags, RoadBits pie
 static CommandCost CheckRoadSlope(Slope tileh, RoadBits *pieces, RoadBits existing, RoadBits other)
 {
 	/* Remove already build pieces */
-	CLRBITS(*pieces, existing);
+	*pieces &= ~existing;
 
 	/* If we can't build anything stop here */
 	if (*pieces == ROAD_NONE) return CMD_ERROR;