diff --git a/tests/qemu-iotests/026 b/tests/qemu-iotests/026
index e302436..ffb18ab 100755
--- a/tests/qemu-iotests/026
+++ b/tests/qemu-iotests/026
@@ -41,8 +41,8 @@
 # Currently only qcow2 supports rebasing
 _supported_fmt qcow2
 _supported_proto file
-_default_cache_mode "writethrough"
-_supported_cache_modes "writethrough" "none"
+_default_cache_mode writethrough
+_supported_cache_modes writethrough none
 # The refcount table tests expect a certain minimum width for refcount entries
 # (so that the refcount table actually needs to grow); that minimum is 16 bits,
 # being the default refcount entry width.
diff --git a/tests/qemu-iotests/039 b/tests/qemu-iotests/039
index 0d4e963..7c730d9 100755
--- a/tests/qemu-iotests/039
+++ b/tests/qemu-iotests/039
@@ -42,8 +42,8 @@
 _supported_fmt qcow2
 _supported_proto file
 _supported_os Linux
-_default_cache_mode "writethrough"
-_supported_cache_modes "writethrough"
+_default_cache_mode writethrough
+_supported_cache_modes writethrough
 
 size=128M
 
diff --git a/tests/qemu-iotests/052 b/tests/qemu-iotests/052
index 6e2ecbf..45a1409 100755
--- a/tests/qemu-iotests/052
+++ b/tests/qemu-iotests/052
@@ -40,7 +40,7 @@
 _supported_proto file
 
 # Don't do O_DIRECT on tmpfs
-_supported_cache_modes "writeback" "writethrough" "unsafe"
+_supported_cache_modes writeback writethrough unsafe
 
 size=128M
 _make_test_img $size
diff --git a/tests/qemu-iotests/091 b/tests/qemu-iotests/091
index d62ef18..f4b4465 100755
--- a/tests/qemu-iotests/091
+++ b/tests/qemu-iotests/091
@@ -46,8 +46,8 @@
 _supported_fmt qcow2
 _supported_proto file
 _supported_os Linux
-_default_cache_mode "none"
-_supported_cache_modes "writethrough" "none" "writeback"
+_default_cache_mode none
+_supported_cache_modes writethrough none writeback
 
 size=1G