Index: JSONRPCDispatcher.cpp
===================================================================
--- JSONRPCDispatcher.cpp
+++ JSONRPCDispatcher.cpp
@@ -277,21 +277,19 @@
     if (LineRef.startswith("#")) // comment
       continue;
 
-    bool IsDelim = LineRef.find_first_not_of('-') == llvm::StringRef::npos;
-    if (!IsDelim) // Line is part of a JSON message.
-      JSON += Line;
-    if (IsDelim) {
-      Out.mirrorInput(
-          llvm::formatv("Content-Length: {0}\r\n\r\n{1}", JSON.size(), JSON));
-      return std::move(JSON);
-    }
+    // found a delimiter
+    if (LineRef.find_first_not_of('-') == llvm::StringRef::npos)
+      break;
+
+    JSON += Line;
   }
 
   if (In.bad()) {
     log("Input error while reading message!");
     return llvm::None;
   } else {
-    log("Input message terminated by EOF");
+    Out.mirrorInput(
+        llvm::formatv("Content-Length: {0}\r\n\r\n{1}", JSON.size(), JSON));
     return std::move(JSON);
   }
 }
Index: clangd/delimited-input-comment-at-the-end.test
===================================================================
--- /dev/null
+++ clangd/delimited-input-comment-at-the-end.test
@@ -0,0 +1,7 @@
+# RUN: clangd -input-style=delimited -run-synchronously < %s 2>&1 | FileCheck %s
+# RUN: clangd -lit-test -run-synchronously < %s 2>&1 | FileCheck %s
+#
+{"jsonrpc":"2.0","id":0,"method":"initialize","params":{"processId":123,"rootPath":"clangd","capabilities":{},"trace":"off"}}
+---
+{"jsonrpc":"2.0","id":3,"method":"exit"}
+# CHECK-NOT: Input message terminated by EOF