diff --git a/src/r_things.c b/src/r_things.c
index f98578e7348a2d3c7fa7f64bd346890a4ab80763..ff9c604ff73ff5e49983c513d36f9d8abe25222e 100644
--- a/src/r_things.c
+++ b/src/r_things.c
@@ -150,7 +150,12 @@ static void R_InstallSpriteLump(UINT16 wad,            // graphics patch
 			sprtemp[frame].lumppat[r + rightfactor] = lumppat;
 			sprtemp[frame].lumpid[r + rightfactor] = lumpid;
 		}
-		sprtemp[frame].flip |= (flipped ? (0x0F << rightfactor) : 0); // 00001111 or 11110000 in binary, depending on rotation being ROT_L or ROT_R
+
+		if (flipped)
+			sprtemp[frame].flip |= (0x0F<<rightfactor); // 00001111 or 11110000 in binary, depending on rotation being ROT_L or ROT_R
+		else
+			sprtemp[frame].flip &= ~(0x0F<<rightfactor); // ditto
+
 		return;
 	}