diff --git a/idea/idea-fir/build.gradle.kts b/idea/idea-fir/build.gradle.kts
index 932ae4f042c..d04e0b943ee 100644
--- a/idea/idea-fir/build.gradle.kts
+++ b/idea/idea-fir/build.gradle.kts
@@ -42,7 +42,7 @@ sourceSets {
     "test" { projectDefault() }
 }
 
-projectTest(parallel = true) {
+projectTest(parallel = false) {
     dependsOn(":dist")
     workingDir = rootDir
     val useFirIdeaPlugin = kotlinBuildProperties.useFirIdeaPlugin