diff --git a/src/mac.rs b/src/mac.rs
index d4636f1..dad6f35 100644
--- a/src/mac.rs
+++ b/src/mac.rs
@@ -12,9 +12,9 @@ pub fn config_local_dir() -> Option<PathBuf> { app_support_dir() }
 pub fn data_dir()         -> Option<PathBuf> { app_support_dir() }
 pub fn data_local_dir()   -> Option<PathBuf> { app_support_dir() }
 pub fn preference_dir()   -> Option<PathBuf> { home_dir().map(|h| h.join("Library/Preferences")) }
-pub fn executable_dir()   -> Option<PathBuf> { None }
-pub fn runtime_dir()      -> Option<PathBuf> { None }
-pub fn state_dir()        -> Option<PathBuf> { None }
+pub const fn executable_dir()   -> Option<PathBuf> { None }
+pub const fn runtime_dir()      -> Option<PathBuf> { None }
+pub const fn state_dir()        -> Option<PathBuf> { None }
 
 pub fn audio_dir()        -> Option<PathBuf> { home_dir().map(|h| h.join("Music")) }
 pub fn desktop_dir()      -> Option<PathBuf> { home_dir().map(|h| h.join("Desktop")) }
@@ -23,5 +23,5 @@ pub fn download_dir()     -> Option<PathBuf> { home_dir().map(|h| h.join("Downlo
 pub fn font_dir()         -> Option<PathBuf> { home_dir().map(|h| h.join("Library/Fonts")) }
 pub fn picture_dir()      -> Option<PathBuf> { home_dir().map(|h| h.join("Pictures")) }
 pub fn public_dir()       -> Option<PathBuf> { home_dir().map(|h| h.join("Public")) }
-pub fn template_dir()     -> Option<PathBuf> { None }
+pub const fn template_dir()     -> Option<PathBuf> { None }
 pub fn video_dir()        -> Option<PathBuf> { home_dir().map(|h| h.join("Movies")) }
diff --git a/src/wasm.rs b/src/wasm.rs
index 3ee1d27..808e781 100644
--- a/src/wasm.rs
+++ b/src/wasm.rs
@@ -2,24 +2,24 @@
 
 use std::path::PathBuf;
 
-pub fn home_dir()         -> Option<PathBuf> { None }
+pub const fn home_dir()         -> Option<PathBuf> { None }
 
-pub fn cache_dir()        -> Option<PathBuf> { None }
-pub fn config_dir()       -> Option<PathBuf> { None }
-pub fn config_local_dir() -> Option<PathBuf> { None }
-pub fn data_dir()         -> Option<PathBuf> { None }
-pub fn data_local_dir()   -> Option<PathBuf> { None }
-pub fn preference_dir()   -> Option<PathBuf> { None }
-pub fn runtime_dir()      -> Option<PathBuf> { None }
-pub fn executable_dir()   -> Option<PathBuf> { None }
-pub fn state_dir()        -> Option<PathBuf> { None }
+pub const fn cache_dir()        -> Option<PathBuf> { None }
+pub const fn config_dir()       -> Option<PathBuf> { None }
+pub const fn config_local_dir() -> Option<PathBuf> { None }
+pub const fn data_dir()         -> Option<PathBuf> { None }
+pub const fn data_local_dir()   -> Option<PathBuf> { None }
+pub const fn preference_dir()   -> Option<PathBuf> { None }
+pub const fn runtime_dir()      -> Option<PathBuf> { None }
+pub const fn executable_dir()   -> Option<PathBuf> { None }
+pub const fn state_dir()        -> Option<PathBuf> { None }
 
-pub fn audio_dir()        -> Option<PathBuf> { None }
-pub fn desktop_dir()      -> Option<PathBuf> { None }
-pub fn document_dir()     -> Option<PathBuf> { None }
-pub fn download_dir()     -> Option<PathBuf> { None }
-pub fn font_dir()         -> Option<PathBuf> { None }
-pub fn picture_dir()      -> Option<PathBuf> { None }
-pub fn public_dir()       -> Option<PathBuf> { None }
-pub fn template_dir()     -> Option<PathBuf> { None }
-pub fn video_dir()        -> Option<PathBuf> { None }
+pub const fn audio_dir()        -> Option<PathBuf> { None }
+pub const fn desktop_dir()      -> Option<PathBuf> { None }
+pub const fn document_dir()     -> Option<PathBuf> { None }
+pub const fn download_dir()     -> Option<PathBuf> { None }
+pub const fn font_dir()         -> Option<PathBuf> { None }
+pub const fn picture_dir()      -> Option<PathBuf> { None }
+pub const fn public_dir()       -> Option<PathBuf> { None }
+pub const fn template_dir()     -> Option<PathBuf> { None }
+pub const fn video_dir()        -> Option<PathBuf> { None }
diff --git a/src/win.rs b/src/win.rs
index 46bbab4..39455ad 100644
--- a/src/win.rs
+++ b/src/win.rs
@@ -9,16 +9,16 @@ pub fn config_dir()       -> Option<PathBuf> { dirs_sys::known_folder_roaming_ap
 pub fn config_local_dir() -> Option<PathBuf> { dirs_sys::known_folder_local_app_data() }
 pub fn data_dir()         -> Option<PathBuf> { dirs_sys::known_folder_roaming_app_data() }
 pub fn data_local_dir()   -> Option<PathBuf> { dirs_sys::known_folder_local_app_data() }
-pub fn executable_dir()   -> Option<PathBuf> { None }
+pub const fn executable_dir()   -> Option<PathBuf> { None }
 pub fn preference_dir()   -> Option<PathBuf> { dirs_sys::known_folder_local_app_data() }
-pub fn runtime_dir()      -> Option<PathBuf> { None }
-pub fn state_dir()        -> Option<PathBuf> { None }
+pub const fn runtime_dir()      -> Option<PathBuf> { None }
+pub const fn state_dir()        -> Option<PathBuf> { None }
 
 pub fn audio_dir()        -> Option<PathBuf> { dirs_sys::known_folder_music() }
 pub fn desktop_dir()      -> Option<PathBuf> { dirs_sys::known_folder_desktop() }
 pub fn document_dir()     -> Option<PathBuf> { dirs_sys::known_folder_documents() }
 pub fn download_dir()     -> Option<PathBuf> { dirs_sys::known_folder_downloads() }
-pub fn font_dir()         -> Option<PathBuf> { None }
+pub const fn font_dir()         -> Option<PathBuf> { None }
 pub fn picture_dir()      -> Option<PathBuf> { dirs_sys::known_folder_pictures() }
 pub fn public_dir()       -> Option<PathBuf> { dirs_sys::known_folder_public()}
 pub fn template_dir()     -> Option<PathBuf> { dirs_sys::known_folder_templates() }