diff --git a/platform/eel/src/com/intellij/platform/eel/fs/EelFileSystemApi.kt b/platform/eel/src/com/intellij/platform/eel/fs/EelFileSystemApi.kt
index 124b216ec9f7..4b9afab59842 100644
--- a/platform/eel/src/com/intellij/platform/eel/fs/EelFileSystemApi.kt
+++ b/platform/eel/src/com/intellij/platform/eel/fs/EelFileSystemApi.kt
@@ -12,10 +12,16 @@ import java.nio.ByteBuffer
 
 @get:ApiStatus.Internal
 val EelFileSystemApi.pathSeparator: String
-  get() = when (this) {
-    is EelFileSystemPosixApi -> ":"
-    is EelFileSystemWindowsApi -> ";"
-    else -> throw UnsupportedOperationException("Unsupported OS: ${this::class.java}")
+  get() = when (descriptor.osFamily) {
+    EelOsFamily.Posix -> ":"
+    EelOsFamily.Windows -> ";"
+  }
+
+@get:ApiStatus.Internal
+val EelFileSystemApi.separator: Char
+  get() = when (descriptor.osFamily) {
+    EelOsFamily.Posix -> '/'
+    EelOsFamily.Windows -> '\\'
   }
 
 @ApiStatus.Internal
@@ -1180,4 +1186,4 @@ suspend fun EelFileSystemApi.copy(
 suspend fun EelFileSystemApi.createTemporaryDirectory(setup: (EelFileSystemApi.CreateTemporaryEntryOptions.Builder).() -> Unit): EelResult<EelPath, EelFileSystemApi.CreateTemporaryEntryError> {
   val options = EelFileSystemApi.CreateTemporaryEntryOptions.Builder().apply(setup).build()
   return createTemporaryDirectory(options)
-}
\ No newline at end of file
+}