diff --git a/pipreqs/pipreqs.py b/pipreqs/pipreqs.py
index 8182115..b3dfa17 100644
--- a/pipreqs/pipreqs.py
+++ b/pipreqs/pipreqs.py
@@ -111,9 +111,9 @@ def get_all_imports(
         candidates += [os.path.splitext(fn)[0] for fn in files]
         for file_name in files:
             file_name = os.path.join(root, file_name)
-            with open(file_name, "r", encoding=encoding) as f:
-                contents = f.read()
             try:
+                with open(file_name, "r", encoding=encoding) as f:
+                    contents = f.read()
                 tree = ast.parse(contents)
                 for node in ast.walk(tree):
                     if isinstance(node, ast.Import):