diff --git a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/KtSymbolByFirBuilder.kt b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/KtSymbolByFirBuilder.kt
index 1a5e3844130..461198a9e0b 100644
--- a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/KtSymbolByFirBuilder.kt
+++ b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/KtSymbolByFirBuilder.kt
@@ -608,7 +608,7 @@ internal class KtSymbolByFirBuilder constructor(
 
 
 private class BuilderCache<From, To : KtSymbol> {
-    private val cache = ContainerUtil.createConcurrentSoftMap<From, To>()
+    private val cache = ContainerUtil.createWeakKeySoftValueMap<From, To>()
 
     inline fun <reified S : To> cache(key: From, calculation: () -> S): S {
         val value = cache.getOrPut(key, calculation)