diff --git a/contrib/fuzzing/all_formats.dict b/contrib/fuzzing/all_formats.dict
index e920f5059b..cc6b4e9366 100644
--- a/contrib/fuzzing/all_formats.dict
+++ b/contrib/fuzzing/all_formats.dict
@@ -5,7 +5,7 @@ amf="ASYLUM Music Format V1.0\x00"
 amf="AMF\x0A"
 
 ams="Extreme"
-ams="AMShdr\x1A\x02\x02"
+ams="AMShdr\x1A\x00\x02\x02"
 
 #dbm="DBM0"
 dbm="NAME"
@@ -49,7 +49,7 @@ far="\x0D\x0A\x1A"
 fmt="FMTracker\x01\x01"
 
 gdm="GDM\xFE"
-gdm="GMFS"
+gdm="\x0D\x0A\x1AGMFS\x01\x00"
 
 imf="IM10"
 imf="IS10"
@@ -202,7 +202,7 @@ psm16="PSAH"
 psm16="PPAT"
 
 ptm="PTMF"
-ptm="\x1A\x03\x02"
+ptm="\x1A\x03\x02\x00"
 
 s3m="SCRM"
 #s3m="SCRS"
diff --git a/contrib/fuzzing/build.sh b/contrib/fuzzing/build.sh
index 833397efe2..a2e6d36cb7 100755
--- a/contrib/fuzzing/build.sh
+++ b/contrib/fuzzing/build.sh
@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 cd "${0%/*}"
 cd ../..
-AFL_HARDEN=1 CONFIG=afl make clean all EXAMPLES=0 TEST=0 OPENMPT123=0 NO_VORBIS=1 NO_VORBISFILE=1 NO_MPG123=1 CHECKED_ADDRESS=1
+AFL_USE_ASAN=1 CONFIG=afl make clean all EXAMPLES=0 TEST=0 OPENMPT123=0 NO_VORBIS=1 NO_VORBISFILE=1 NO_MPG123=1 CHECKED_ADDRESS=1
diff --git a/contrib/fuzzing/get-afl.sh b/contrib/fuzzing/get-afl.sh
index 16f0c3649a..decc4af4b3 100755
--- a/contrib/fuzzing/get-afl.sh
+++ b/contrib/fuzzing/get-afl.sh
@@ -12,7 +12,7 @@ wget $AFL_URL || exit
 tar -xzvf $AFL_FILENAME
 rm $AFL_FILENAME
 cd AFLplusplus-*
-make source-only || exit
+make PERFORMANCE=1 source-only || exit
 cd ..
 rm -rf afl
 mv AFLplusplus-* afl
\ No newline at end of file