diff --git a/src/modules/custom.rs b/src/modules/custom.rs
index 02c2f6f1..ee1e0738 100644
--- a/src/modules/custom.rs
+++ b/src/modules/custom.rs
@@ -21,6 +21,12 @@ pub fn module<'a>(name: &str, context: &'a Context) -> Option<Module<'a>> {
     );
     let config = CustomConfig::load(toml_config);
 
+    if let Some(os) = config.os {
+        if os != env::consts::OS && !(os == "unix" && cfg!(unix)) {
+            return None;
+        }
+    }
+
     let mut is_match = context
         .try_begin_scan()?
         .set_files(&config.files)
@@ -38,12 +44,6 @@ pub fn module<'a>(name: &str, context: &'a Context) -> Option<Module<'a>> {
         }
     }
 
-    if let Some(os) = config.os {
-        if os != env::consts::OS && !(os == "unix" && cfg!(unix)) {
-            return None;
-        }
-    }
-
     let mut module = Module::new(name, config.description, Some(toml_config));
 
     let parsed = StringFormatter::new(config.format).and_then(|formatter| {