diff --git a/tests/api-test-2.c b/tests/api-test-2.c
index c7e930ca..2de2a8a0 100644
--- a/tests/api-test-2.c
+++ b/tests/api-test-2.c
@@ -1727,15 +1727,17 @@ static void ResizeDeviceLuks2(void)
 	OK_(crypt_deactivate(cd, CDEVICE_1));
 	CRYPT_FREE(cd);
 
-	OK_(crypt_init(&cd, DMDIR L_DEVICE_OK));
-	OK_(crypt_set_pbkdf_type(cd, &min_pbkdf2));
-	OK_(crypt_format(cd, CRYPT_LUKS2, capi_cipher, capi_cipher_mode, NULL, key, key_size, NULL));
-	OK_(crypt_activate_by_volume_key(cd, CDEVICE_1, key, key_size, 0));
-	OK_(crypt_resize(cd, CDEVICE_1, 8));
-	if (!t_device_size(DMDIR CDEVICE_1, &r_size))
-		EQ_(8, r_size >> TST_SECTOR_SHIFT);
-	OK_(crypt_deactivate(cd, CDEVICE_1));
-	CRYPT_FREE(cd);
+	if (t_dm_capi_string_supported()) {
+		OK_(crypt_init(&cd, DMDIR L_DEVICE_OK));
+		OK_(crypt_set_pbkdf_type(cd, &min_pbkdf2));
+		OK_(crypt_format(cd, CRYPT_LUKS2, capi_cipher, capi_cipher_mode, NULL, key, key_size, NULL));
+		OK_(crypt_activate_by_volume_key(cd, CDEVICE_1, key, key_size, 0));
+		OK_(crypt_resize(cd, CDEVICE_1, 8));
+		if (!t_device_size(DMDIR CDEVICE_1, &r_size))
+			EQ_(8, r_size >> TST_SECTOR_SHIFT);
+		OK_(crypt_deactivate(cd, CDEVICE_1));
+		CRYPT_FREE(cd);
+	}
 
 	_cleanup_dmdevices();
 }
diff --git a/tests/api_test.h b/tests/api_test.h
index 51843eab..3088309f 100644
--- a/tests/api_test.h
+++ b/tests/api_test.h
@@ -40,6 +40,7 @@ int t_dm_crypt_cpu_switch_support(void);
 int t_dm_crypt_discard_support(void);
 int t_dm_integrity_resize_support(void);
 int t_dm_integrity_recalculate_support(void);
+int t_dm_capi_string_supported(void);
 int t_set_readahead(const char *device, unsigned value);
 
 int fips_mode(void);
diff --git a/tests/test_utils.c b/tests/test_utils.c
index 599fe556..e09a24f7 100644
--- a/tests/test_utils.c
+++ b/tests/test_utils.c
@@ -685,6 +685,11 @@ int t_dm_integrity_recalculate_support(void)
 	return t_dm_crypt_flags & T_DM_INTEGRITY_RECALC_SUPPORTED;
 }
 
+int t_dm_capi_string_supported(void)
+{
+	return t_dm_crypt_flags & T_DM_CAPI_STRING_SUPPORTED;
+}
+
 /* loop helpers */
 
 #define LOOP_DEV_MAJOR 7