diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index f30e765ab42c3..ed3057895fae8 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -10766,7 +10766,9 @@ namespace ts {
                     && isCallExpression(decl.initializer)
                     && isRequireCall(decl.initializer, /*requireStringLiteralLikeArgument*/ true)
                     && valueType.symbol;
-                if (isRequireAlias || node.kind === SyntaxKind.ImportType) {
+                const isImportType = node.kind === SyntaxKind.ImportType;
+                const isDelayedMergeClass = symbol !== valueType.symbol && getMergedSymbol(symbol) === valueType.symbol;
+                if (isRequireAlias || isImportType || isDelayedMergeClass) {
                     typeType = getTypeReferenceType(node, valueType.symbol);
                 }
             }
diff --git a/tests/baselines/reference/jsdocTypeReferenceToMergedClass.symbols b/tests/baselines/reference/jsdocTypeReferenceToMergedClass.symbols
new file mode 100644
index 0000000000000..229163c5d788b
--- /dev/null
+++ b/tests/baselines/reference/jsdocTypeReferenceToMergedClass.symbols
@@ -0,0 +1,35 @@
+=== tests/cases/conformance/jsdoc/test.js ===
+// https://github.com/microsoft/TypeScript/issues/34685
+
+/** @param {Workspace.Project} p */
+function demo(p) {
+>demo : Symbol(demo, Decl(test.js, 0, 0))
+>p : Symbol(p, Decl(test.js, 3, 14))
+
+    p.isServiceProject()
+>p.isServiceProject : Symbol(isServiceProject, Decl(mod1.js, 3, 31))
+>p : Symbol(p, Decl(test.js, 3, 14))
+>isServiceProject : Symbol(isServiceProject, Decl(mod1.js, 3, 31))
+}
+=== tests/cases/conformance/jsdoc/mod1.js ===
+// Note: mod1.js needs to appear second to trigger the bug
+var Workspace = {}
+>Workspace : Symbol(Workspace, Decl(mod1.js, 1, 3), Decl(mod1.js, 1, 18), Decl(mod1.js, 2, 37))
+
+Workspace.Project = function wp() { }
+>Workspace.Project : Symbol(Workspace.Project, Decl(mod1.js, 1, 18), Decl(mod1.js, 3, 10))
+>Workspace : Symbol(Workspace, Decl(mod1.js, 1, 3), Decl(mod1.js, 1, 18), Decl(mod1.js, 2, 37))
+>Project : Symbol(Workspace.Project, Decl(mod1.js, 1, 18), Decl(mod1.js, 3, 10))
+>wp : Symbol(wp, Decl(mod1.js, 2, 19))
+
+Workspace.Project.prototype = {
+>Workspace.Project.prototype : Symbol(Workspace.Project.prototype, Decl(mod1.js, 2, 37))
+>Workspace.Project : Symbol(Workspace.Project, Decl(mod1.js, 1, 18), Decl(mod1.js, 3, 10))
+>Workspace : Symbol(Workspace, Decl(mod1.js, 1, 3), Decl(mod1.js, 1, 18), Decl(mod1.js, 2, 37))
+>Project : Symbol(Workspace.Project, Decl(mod1.js, 1, 18), Decl(mod1.js, 3, 10))
+>prototype : Symbol(Workspace.Project.prototype, Decl(mod1.js, 2, 37))
+
+  isServiceProject() {}
+>isServiceProject : Symbol(isServiceProject, Decl(mod1.js, 3, 31))
+}
+
diff --git a/tests/baselines/reference/jsdocTypeReferenceToMergedClass.types b/tests/baselines/reference/jsdocTypeReferenceToMergedClass.types
new file mode 100644
index 0000000000000..c4e380f8c0eb7
--- /dev/null
+++ b/tests/baselines/reference/jsdocTypeReferenceToMergedClass.types
@@ -0,0 +1,41 @@
+=== tests/cases/conformance/jsdoc/test.js ===
+// https://github.com/microsoft/TypeScript/issues/34685
+
+/** @param {Workspace.Project} p */
+function demo(p) {
+>demo : (p: wp) => void
+>p : wp
+
+    p.isServiceProject()
+>p.isServiceProject() : void
+>p.isServiceProject : () => void
+>p : wp
+>isServiceProject : () => void
+}
+=== tests/cases/conformance/jsdoc/mod1.js ===
+// Note: mod1.js needs to appear second to trigger the bug
+var Workspace = {}
+>Workspace : typeof Workspace
+>{} : {}
+
+Workspace.Project = function wp() { }
+>Workspace.Project = function wp() { } : typeof wp
+>Workspace.Project : typeof wp
+>Workspace : typeof Workspace
+>Project : typeof wp
+>function wp() { } : typeof wp
+>wp : typeof wp
+
+Workspace.Project.prototype = {
+>Workspace.Project.prototype = {  isServiceProject() {}} : { isServiceProject(): void; }
+>Workspace.Project.prototype : { isServiceProject(): void; }
+>Workspace.Project : typeof wp
+>Workspace : typeof Workspace
+>Project : typeof wp
+>prototype : { isServiceProject(): void; }
+>{  isServiceProject() {}} : { isServiceProject(): void; }
+
+  isServiceProject() {}
+>isServiceProject : () => void
+}
+
diff --git a/tests/cases/conformance/jsdoc/jsdocTypeReferenceToMergedClass.ts b/tests/cases/conformance/jsdoc/jsdocTypeReferenceToMergedClass.ts
new file mode 100644
index 0000000000000..e559ffd27ca6f
--- /dev/null
+++ b/tests/cases/conformance/jsdoc/jsdocTypeReferenceToMergedClass.ts
@@ -0,0 +1,17 @@
+// https://github.com/microsoft/TypeScript/issues/34685
+// @noEmit: true
+// @allowJs: true
+// @checkJs: true
+
+// @Filename: test.js
+/** @param {Workspace.Project} p */
+function demo(p) {
+    p.isServiceProject()
+}
+// @Filename: mod1.js
+// Note: mod1.js needs to appear second to trigger the bug
+var Workspace = {}
+Workspace.Project = function wp() { }
+Workspace.Project.prototype = {
+  isServiceProject() {}
+}