--- ttaenc-3.4.1-src.old/ttaenc.c
+++ ttaenc-3.4.1-src/ttaenc.c
@@ -525,7 +525,7 @@
 	*pA   = *pB;
 }
 
-__inline void hybrid_filter (fltst *fs, int *in, int mode) {
+void hybrid_filter (fltst *fs, int *in, int mode) {
 	register int *pA = fs->dl;
 	register int *pB = fs->qm;
 	register int *pM = fs->dx;