diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 4765ceb413..7a9d897606 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -676,14 +676,11 @@ include $(SUBDIR)../subdir.mak
 
 $(SUBDIR)dct-test$(EXESUF): $(SUBDIR)dctref.o
 
-$(SUBDIR)cos_tables.c: $(SUBDIR)costablegen$(HOSTEXESUF)
-	$(M)./$< > $@
+TRIG_TABLES  = cos cos_fixed sin
+TRIG_TABLES := $(TRIG_TABLES:%=$(SUBDIR)%_tables.c)
 
-$(SUBDIR)cos_fixed_tables.c: $(SUBDIR)costablegen$(HOSTEXESUF)
-	$(M)./$< cos fixed > $@
-
-$(SUBDIR)sin_tables.c: $(SUBDIR)costablegen$(HOSTEXESUF)
-	$(M)./$< sin > $@
+$(TRIG_TABLES): $(SUBDIR)%_tables.c: $(SUBDIR)costablegen$(HOSTEXESUF)
+	$(M)./$< $* > $@
 
 ifdef CONFIG_SMALL
 $(SUBDIR)%_tablegen$(HOSTEXESUF): HOSTCFLAGS += -DCONFIG_SMALL=1
diff --git a/libavcodec/costablegen.c b/libavcodec/costablegen.c
index 6bfb8eabf2..5e52c482c6 100644
--- a/libavcodec/costablegen.c
+++ b/libavcodec/costablegen.c
@@ -51,7 +51,7 @@ int main(int argc, char *argv[])
 {
     int i, j;
     int do_sin = argc > 1 && !strcmp(argv[1], "sin");
-    int fixed  = argc > 2 && !strcmp(argv[2], "fixed");
+    int fixed  = argc > 1 &&  strstr(argv[1], "fixed");
     double (*func)(double) = do_sin ? sin : cos;
 
     printf("/* This file was automatically generated. */\n");