diff --git a/src/p_maputl.cpp b/src/p_maputl.cpp
index 2835896f98..eee5167ce8 100644
--- a/src/p_maputl.cpp
+++ b/src/p_maputl.cpp
@@ -1398,7 +1398,7 @@ intercept_t *FPathTraverse::Next()
 //
 //===========================================================================
 
-FPathTraverse::FPathTraverse (fixed_t x1, fixed_t y1, fixed_t x2, fixed_t y2, int flags)
+void FPathTraverse::init (fixed_t x1, fixed_t y1, fixed_t x2, fixed_t y2, int flags)
 {
 	fixed_t 	xt1, xt2;
 	fixed_t 	yt1, yt2;
diff --git a/src/p_maputl.h b/src/p_maputl.h
index 452f99b3d0..415d4b83bd 100644
--- a/src/p_maputl.h
+++ b/src/p_maputl.h
@@ -325,6 +325,7 @@ public:
 
 class FPathTraverse
 {
+protected:
 	static TArray<intercept_t> intercepts;
 
 	divline_t trace;
@@ -332,14 +333,19 @@ class FPathTraverse
 	unsigned int intercept_count;
 	unsigned int count;
 
-	void AddLineIntercepts(int bx, int by);
-	void AddThingIntercepts(int bx, int by, FBlockThingsIterator &it, bool compatible);
+	virtual void AddLineIntercepts(int bx, int by);
+	virtual void AddThingIntercepts(int bx, int by, FBlockThingsIterator &it, bool compatible);
+	void init(fixed_t x1, fixed_t y1, fixed_t x2, fixed_t y2, int flags);
+	FPathTraverse() {}
 public:
 
 	intercept_t *Next();
 
-	FPathTraverse(fixed_t x1, fixed_t y1, fixed_t x2, fixed_t y2, int flags);
-	~FPathTraverse();
+	FPathTraverse(fixed_t x1, fixed_t y1, fixed_t x2, fixed_t y2, int flags)
+	{
+		init(x1, y1, x2, y2, flags);
+	}
+	virtual ~FPathTraverse();
 	const divline_t &Trace() const { return trace; }
 };