diff --git a/crt_core.c b/crt_core.c
index b0ff51d..7424f43 100644
--- a/crt_core.c
+++ b/crt_core.c
@@ -278,7 +278,7 @@ crt_demodulate(struct CRT *v, int noise)
     int max_e; /* approx maximum energy in a scan line */
 #endif
     
-    crt_sincos14(&huesn, &huecs, ((v->hue % 360) + 33) * 8192 / 180);
+    crt_sincos14(&huesn, &huecs, ((v->hue % 360) - 33) * 8192 / 180);
     huesn >>= 11; /* make 4-bit */
     huecs >>= 11;