diff --git a/src/r_things.c b/src/r_things.c
index 1352209d7..fa0316bf7 100644
--- a/src/r_things.c
+++ b/src/r_things.c
@@ -148,7 +148,11 @@ 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;
 	}