diff --git a/compiler/fir/jvm/src/org/jetbrains/kotlin/fir/scopes/jvm/DescriptorUtils.kt b/compiler/fir/jvm/src/org/jetbrains/kotlin/fir/scopes/jvm/DescriptorUtils.kt
index a32f5cf6a7a..d0dcb39b579 100644
--- a/compiler/fir/jvm/src/org/jetbrains/kotlin/fir/scopes/jvm/DescriptorUtils.kt
+++ b/compiler/fir/jvm/src/org/jetbrains/kotlin/fir/scopes/jvm/DescriptorUtils.kt
@@ -77,7 +77,7 @@ private val PRIMITIVE_TYPE_SIGNATURE: Map<String, String> = mapOf(
     "Char" to "C",
     "Short" to "S",
     "Int" to "I",
-    "Long" to "L",
+    "Long" to "J",
     "Float" to "F",
     "Double" to "D",
 )