diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index dbce5f41ef4..b6e68cb1dc3 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -6524,6 +6524,7 @@ namespace ts {
             let targetStack: Type[];
             let depth = 0;
             let inferiority = 0;
+            const visited: Map<boolean> = {};
             inferFromTypes(source, target);
 
             function isInProcess(source: Type, target: Type) {
@@ -6653,6 +6654,12 @@ namespace ts {
                             return;
                         }
 
+                        const key = source.id + "," + target.id;
+                        if (hasProperty(visited, key)) {
+                            return;
+                        }
+                        visited[key] = true;
+
                         if (depth === 0) {
                             sourceStack = [];
                             targetStack = [];