diff --git a/src/tables.c b/src/tables.c
index 8c4dc50e1..6a7b7645b 100644
--- a/src/tables.c
+++ b/src/tables.c
@@ -167,7 +167,7 @@ angle_t FixedAngle(fixed_t fa)
 	return AngleAdj(cfa, cwf, ra);
 }
 
-INT32 AngleDelta(angle_t a1, angle_t a2)
+angle_t AngleDelta(angle_t a1, angle_t a2)
 {
 	angle_t delta = a1 - a2;
 
diff --git a/src/tables.h b/src/tables.h
index ac3bfe8a5..f8947ab9e 100644
--- a/src/tables.h
+++ b/src/tables.h
@@ -110,7 +110,7 @@ FUNCMATH angle_t FixedAngle(fixed_t fa);
 // and with a factor, with +factor for (fa/factor) and -factor for (fa*factor)
 FUNCMATH angle_t FixedAngleC(fixed_t fa, fixed_t factor);
 // difference between two angle_t
-FUNCMATH INT32 AngleDelta(angle_t a1, angle_t a2);
+FUNCMATH angle_t AngleDelta(angle_t a1, angle_t a2);
 FUNCMATH INT32 AngleDeltaSigned(angle_t a1, angle_t a2);
 FUNCMATH float AngleToFloat(angle_t x);
 FUNCMATH angle_t FloatToAngle(float f);