diff --git a/src/sys/driver.h b/src/sys/driver.h
index 019cc67d..4b326905 100644
--- a/src/sys/driver.h
+++ b/src/sys/driver.h
@@ -45,7 +45,6 @@
 #define FSP_ALLOC_INTERNAL_TAG          'IpsF'
 #define FSP_ALLOC_EXTERNAL_TAG          'XpsF'
 #define FSP_IO_INCREMENT                IO_NETWORK_INCREMENT
-#define FSP_VOLUME_PREFIX_CASE_INS      TRUE
 
 /* debug */
 #if DBG
@@ -850,7 +849,7 @@ static inline
 BOOLEAN FspFsvolDeviceVolumePrefixInString(PDEVICE_OBJECT DeviceObject, PUNICODE_STRING String)
 {
     return RtlPrefixUnicodeString(&FspFsvolDeviceExtension(DeviceObject)->VolumePrefix, String,
-        FSP_VOLUME_PREFIX_CASE_INS);
+        TRUE);
 }
 NTSTATUS FspDeviceCopyList(
     PDEVICE_OBJECT **PDeviceObjects, PULONG PDeviceObjectCount);
diff --git a/src/sys/fsctl.c b/src/sys/fsctl.c
index 2b12c704..c5eecfc9 100644
--- a/src/sys/fsctl.c
+++ b/src/sys/fsctl.c
@@ -205,9 +205,7 @@ static NTSTATUS FspFsvolFileSystemControlReparsePoint(
                             TargetFileNameIndex += FsvolDeviceExtension->VolumePrefix.Length;
 
                             if (TargetFileNameIndex < ReparseTargetPathLength &&
-                                RtlEqualUnicodeString(&FsvolDeviceExtension->VolumePrefix,
-                                    &TargetObjectName,
-                                    FSP_VOLUME_PREFIX_CASE_INS))
+                                FspFsvolDeviceVolumePrefixInString(FsvolDeviceObject, &TargetObjectName))
                                 TargetOnFileSystem = (UINT16)TargetFileNameIndex;
                         }
                     }