diff --git a/test/nvmf/target/multiconnection.sh b/test/nvmf/target/multiconnection.sh
index 6a6c562b0..744217fd0 100755
--- a/test/nvmf/target/multiconnection.sh
+++ b/test/nvmf/target/multiconnection.sh
@@ -5,7 +5,7 @@ rootdir=$(readlink -f $testdir/../../..)
 source $rootdir/test/common/autotest_common.sh
 source $rootdir/test/nvmf/common.sh
 
-MALLOC_BDEV_SIZE=128
+MALLOC_BDEV_SIZE=64
 MALLOC_BLOCK_SIZE=512
 NVMF_SUBSYS=11
 
diff --git a/test/nvmf/target/nmic.sh b/test/nvmf/target/nmic.sh
index ad05698ef..cedcda5b6 100755
--- a/test/nvmf/target/nmic.sh
+++ b/test/nvmf/target/nmic.sh
@@ -5,7 +5,7 @@ rootdir=$(readlink -f $testdir/../../..)
 source $rootdir/test/common/autotest_common.sh
 source $rootdir/test/nvmf/common.sh
 
-MALLOC_BDEV_SIZE=128
+MALLOC_BDEV_SIZE=64
 MALLOC_BLOCK_SIZE=512
 
 rpc_py="$rootdir/scripts/rpc.py"
diff --git a/test/nvmf/target/shutdown.sh b/test/nvmf/target/shutdown.sh
index 1e166f652..29367dd88 100755
--- a/test/nvmf/target/shutdown.sh
+++ b/test/nvmf/target/shutdown.sh
@@ -5,7 +5,7 @@ rootdir=$(readlink -f $testdir/../../..)
 source $rootdir/test/common/autotest_common.sh
 source $rootdir/test/nvmf/common.sh
 
-MALLOC_BDEV_SIZE=128
+MALLOC_BDEV_SIZE=64
 MALLOC_BLOCK_SIZE=512
 
 rpc_py="$rootdir/scripts/rpc.py"