diff --git a/tools/graph2dot.c b/tools/graph2dot.c
index 15a9012989..a52416db31 100644
--- a/tools/graph2dot.c
+++ b/tools/graph2dot.c
@@ -20,7 +20,6 @@
 
 #include <unistd.h>             /* getopt */
 
-#undef HAVE_AV_CONFIG_H
 #include "libavutil/pixdesc.h"
 #include "libavutil/audioconvert.h"
 #include "libavfilter/avfiltergraph.h"
diff --git a/tools/pktdumper.c b/tools/pktdumper.c
index bfccd7c769..c3a3a218ef 100644
--- a/tools/pktdumper.c
+++ b/tools/pktdumper.c
@@ -29,8 +29,6 @@
 
 #define PKTFILESUFF "_%08" PRId64 "_%02d_%010" PRId64 "_%06d_%c.bin"
 
-#undef strcat
-
 static int usage(int ret)
 {
     fprintf(stderr, "dump (up to maxpkts) AVPackets as they are demuxed by libavformat.\n");