diff --git a/configure b/configure
index 0024d3435b..cce077b3c9 100755
--- a/configure
+++ b/configure
@@ -1115,7 +1115,7 @@ return 0;
 EOF
 
 mm3dnow=no
-if $cc -march=athlon -o $TMPO $TMPC 2> /dev/null ; then
+if $cc -m3dnow -o $TMPO $TMPC 2> /dev/null ; then
   mm3dnow=yes
 fi
 
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index aba23b35a2..6f82a5bd3e 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -350,7 +350,7 @@ depend: CFLAGS+= -msse
 endif
 ifdef TARGET_BUILTIN_3DNOW
 i386/fft_3dn.o: CFLAGS+= -m3dnow
-i386/fft_3dn2.o: CFLAGS+= -march=athlon
+i386/fft_3dn2.o: CFLAGS+= -m3dnow
 endif
 endif