diff --git a/diktat-common/src/main/kotlin/org/cqfn/diktat/common/config/rules/RulesConfigReader.kt b/diktat-common/src/main/kotlin/org/cqfn/diktat/common/config/rules/RulesConfigReader.kt
index 78eee8f29d..d4db28b013 100644
--- a/diktat-common/src/main/kotlin/org/cqfn/diktat/common/config/rules/RulesConfigReader.kt
+++ b/diktat-common/src/main/kotlin/org/cqfn/diktat/common/config/rules/RulesConfigReader.kt
@@ -162,11 +162,7 @@ data class CommonConfiguration(private val configuration: Map<String, String>?)
      * Get source directories from configuration
      */
     val srcDirectories: List<String> by lazy {
-        val srcDirs = configuration?.get("srcDirectories")?.split(",")?.map { it.trim() } ?: listOf("main")
-        if (srcDirs.any { !it.lowercase(Locale.getDefault()).endsWith("main") }) {
-            log.error("source directory names should end with `main`")
-        }
-        srcDirs
+        configuration?.get("srcDirectories")?.split(",")?.map { it.trim() } ?: listOf("main")
     }
 
     companion object {