conf/example.conf.in         | 6 ++++++
 lib/config/config_settings.h | 2 +-
 lib/config/defaults.h        | 1 +
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/conf/example.conf.in b/conf/example.conf.in
index 6f7b161..9fa1235 100644
--- a/conf/example.conf.in
+++ b/conf/example.conf.in
@@ -326,6 +326,12 @@ devices {
 	# Enabling this setting allows the VG to be used as usual even with
 	# uncertain devices.
 	allow_changes_with_duplicate_pvs = 1
+
+	# Configuration option devices/allow_mixed_block_sizes.
+	# Allow PVs in the same VG with different logical block sizes.
+	# When allowed, the user is responsible to ensure that an LV is
+	# using PVs with matching block sizes when necessary.
+	allow_mixed_block_sizes = 1
 }
 
 # Configuration section allocation.
diff --git a/lib/config/config_settings.h b/lib/config/config_settings.h
index 622e982..055b883 100644
--- a/lib/config/config_settings.h
+++ b/lib/config/config_settings.h
@@ -470,7 +470,7 @@ cfg(devices_allow_changes_with_duplicate_pvs_CFG, "allow_changes_with_duplicate_
 	"Enabling this setting allows the VG to be used as usual even with\n"
 	"uncertain devices.\n")
 
-cfg(devices_allow_mixed_block_sizes_CFG, "allow_mixed_block_sizes", devices_CFG_SECTION, 0, CFG_TYPE_BOOL, 0, vsn(2, 3, 6), NULL, 0, NULL,
+cfg(devices_allow_mixed_block_sizes_CFG, "allow_mixed_block_sizes", devices_CFG_SECTION, 0, CFG_TYPE_BOOL, DEFAULT_ALLOW_MIXED_BLOCK_SIZES, vsn(2, 2, 186), NULL, 0, NULL,
 	"Allow PVs in the same VG with different logical block sizes.\n"
 	"When allowed, the user is responsible to ensure that an LV is\n"
 	"using PVs with matching block sizes when necessary.\n")
diff --git a/lib/config/defaults.h b/lib/config/defaults.h
index 0d55928..e689208 100644
--- a/lib/config/defaults.h
+++ b/lib/config/defaults.h
@@ -46,6 +46,7 @@
 #define DEFAULT_ISSUE_DISCARDS 0
 #define DEFAULT_PV_MIN_SIZE_KB 2048
 #define DEFAULT_ALLOW_CHANGES_WITH_DUPLICATE_PVS 1
+#define DEFAULT_ALLOW_MIXED_BLOCK_SIZES 1
 
 #define DEFAULT_LOCKING_LIB "liblvm2clusterlock.so"
 #define DEFAULT_ERROR_WHEN_FULL 0