diff --git a/parser/src/keys/mod.rs b/parser/src/keys/mod.rs
index 38c5ddd32..ce12f5f3b 100644
--- a/parser/src/keys/mod.rs
+++ b/parser/src/keys/mod.rs
@@ -11,36 +11,43 @@ mod windows;
 mod mappings;
 pub use mappings::*;
 
+#[cfg(any(target_os = "unknown"))]
 #[derive(Clone, Copy)]
 pub enum Platform {
     Win,
     Linux,
 }
 
-pub static OSCODE_MAPPING_VARIANT: Mutex<Platform> = Mutex::new({
-    if cfg!(target_os = "linux") {
-        Platform::Linux
-    } else if cfg!(target_os = "windows") {
-        Platform::Win
-    } else {
-        // use whatever value as a fallback
-        Platform::Linux
-    }
-});
+#[cfg(any(target_os = "unknown"))]
+pub static OSCODE_MAPPING_VARIANT: Mutex<Platform> = Mutex::new(Platform::Linux);
 
 impl OsCode {
     pub fn as_u16(self) -> u16 {
-        match *OSCODE_MAPPING_VARIANT.lock() {
+        #[cfg(any(target_os = "unknown"))]
+        return match *OSCODE_MAPPING_VARIANT.lock() {
             Platform::Win => self.as_u16_windows(),
             Platform::Linux => self.as_u16_linux(),
-        }
+        };
+
+        #[cfg(any(target_os = "linux"))]
+        return self.as_u16_linux();
+
+        #[cfg(any(target_os = "windows"))]
+        return self.as_u16_windows();
     }
 
     pub fn from_u16(code: u16) -> Option<Self> {
-        match *OSCODE_MAPPING_VARIANT.lock() {
+        #[cfg(any(target_os = "unknown"))]
+        return match *OSCODE_MAPPING_VARIANT.lock() {
             Platform::Win => OsCode::from_u16_windows(code),
             Platform::Linux => OsCode::from_u16_linux(code),
-        }
+        };
+
+        #[cfg(any(target_os = "linux"))]
+        return OsCode::from_u16_linux(code);
+
+        #[cfg(any(target_os = "windows"))]
+        return OsCode::from_u16_windows(code);
     }
 }