diff --git a/tests/run_tests.py b/tests/run_tests.py
index 5d01c47a8c5e1e59edc78657fb78a0b8d60c04d5..689b8b3888660a2e1987a23ad9ae7fca76095dc7 100644
--- a/tests/run_tests.py
+++ b/tests/run_tests.py
@@ -154,7 +154,7 @@ elif sys.platform == "win32":
        message("Error: the folder ../Build has not been found!")
        exit(1)
 
-    src_files = os.listdir("..\Build")
+    src_files = os.listdir("../Build")
     for file_name in src_files:
         full_file_name = os.path.join("..\Build", file_name)
         if os.path.isfile(full_file_name) and full_file_name.endswith(".dll"):