diff --git a/utbot-python/src/main/kotlin/org/utbot/python/framework/codegen/utils/StringUtils.kt b/utbot-python/src/main/kotlin/org/utbot/python/framework/codegen/utils/StringUtils.kt
index 409b7acc85..40f3b5b831 100644
--- a/utbot-python/src/main/kotlin/org/utbot/python/framework/codegen/utils/StringUtils.kt
+++ b/utbot-python/src/main/kotlin/org/utbot/python/framework/codegen/utils/StringUtils.kt
@@ -4,5 +4,9 @@ import java.nio.file.FileSystems
 
 
 fun String.toRelativeRawPath(): String {
-    return "os.path.dirname(__file__) + r'${FileSystems.getDefault().separator}${this}'"
+    val dirname = "os.path.dirname(__file__)"
+    if (this.isEmpty()) {
+        return dirname
+    }
+    return "$dirname + r'${FileSystems.getDefault().separator}${this}'"
 }
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