diff --git a/src/main/kotlin/org/rust/lang/core/macros/proc/ProcMacroServerPool.kt b/src/main/kotlin/org/rust/lang/core/macros/proc/ProcMacroServerPool.kt
index faa30552d9e..20f8761867e 100644
--- a/src/main/kotlin/org/rust/lang/core/macros/proc/ProcMacroServerPool.kt
+++ b/src/main/kotlin/org/rust/lang/core/macros/proc/ProcMacroServerPool.kt
@@ -165,8 +165,8 @@ private class ProcMacroServerProcess private constructor(
     private val process: Process,
     private val timeout: Long = Registry.get("org.rust.macros.proc.timeout").asInteger().toLong(),
 ) : Runnable, Disposable {
-    private val stdout: BufferedReader = BufferedReader(InputStreamReader(process.inputStream))
-    private val stdin: Writer = OutputStreamWriter(process.outputStream)
+    private val stdout: BufferedReader = BufferedReader(InputStreamReader(process.inputStream, Charsets.UTF_8))
+    private val stdin: Writer = OutputStreamWriter(process.outputStream, Charsets.UTF_8)
 
     private val lock = ReentrantLock()
     private val requestQueue = SynchronousQueue<Pair<Request, CompletableFuture<Response>>>()
diff --git a/src/test/kotlin/org/rust/lang/core/macros/proc/RsProcMacroExpansionTest.kt b/src/test/kotlin/org/rust/lang/core/macros/proc/RsProcMacroExpansionTest.kt
index c0a5c69fca7..78b4e28a380 100644
--- a/src/test/kotlin/org/rust/lang/core/macros/proc/RsProcMacroExpansionTest.kt
+++ b/src/test/kotlin/org/rust/lang/core/macros/proc/RsProcMacroExpansionTest.kt
@@ -122,6 +122,7 @@ class RsProcMacroExpansionTest : RsWithToolchainTestBase() {
             checkExpansion(lib, "as_is", ".", ".")
             checkExpansion(lib, "as_is", "..", "..")
             checkExpansion(lib, "as_is", "fn foo() {}", "fn foo() {}")
+            checkExpansion(lib, "as_is", "\"Привет\"", "\"Привет\"") // "Hello" in russian, a test for non-ASCII chars
             checkExpansion(lib, "read_env_var", "", "\"foo value\"", env = mapOf("FOO_ENV_VAR" to "foo value"))
             checkExpansion(lib, "do_println", "", "")
             checkExpansion(lib, "do_eprintln", "", "")