diff --git a/compiler/backend/src/org/jetbrains/kotlin/codegen/inline/InlineCache.kt b/compiler/backend/src/org/jetbrains/kotlin/codegen/inline/InlineCache.kt
index efced94ca28..8e7d1d5a063 100644
--- a/compiler/backend/src/org/jetbrains/kotlin/codegen/inline/InlineCache.kt
+++ b/compiler/backend/src/org/jetbrains/kotlin/codegen/inline/InlineCache.kt
@@ -28,12 +28,14 @@ class InlineCache {
 }
 
 inline fun <K, V : Any> SLRUMap<K, V>.getOrPut(key: K, defaultValue: () -> V): V {
-    val value = get(key)
-    return if (value == null) {
-        val answer = defaultValue()
-        put(key, answer)
-        answer
-    } else {
-        value
+    synchronized(this) {
+        val value = get(key)
+        return if (value == null) {
+            val answer = defaultValue()
+            put(key, answer)
+            answer
+        } else {
+            value
+        }
     }
 }