diff --git a/hotkey_darwin.go b/hotkey_darwin.go
index 858f196..95daa80 100644
--- a/hotkey_darwin.go
+++ b/hotkey_darwin.go
@@ -72,10 +72,10 @@ type Modifier uint32
 
 // All kinds of Modifiers
 const (
-	ModCtrl   = 0x1000
-	ModShift  = 0x200
-	ModOption = 0x800
-	ModCmd    = 0x100
+	ModCtrl   Modifier = 0x1000
+	ModShift  Modifier = 0x200
+	ModOption Modifier = 0x800
+	ModCmd    Modifier = 0x100
 )
 
 // Key represents a key.
diff --git a/hotkey_linux.go b/hotkey_linux.go
index a67d3f2..8bc1913 100644
--- a/hotkey_linux.go
+++ b/hotkey_linux.go
@@ -61,13 +61,13 @@ type Modifier uint32
 // All kinds of Modifiers
 // See /usr/include/X11/X.h
 const (
-	ModCtrl  = (1 << 2)
-	ModShift = (1 << 0)
-	Mod1     = (1 << 3)
-	Mod2     = (1 << 4)
-	Mod3     = (1 << 5)
-	Mod4     = (1 << 6)
-	Mod5     = (1 << 7)
+	ModCtrl  Modifier = (1 << 2)
+	ModShift Modifier = (1 << 0)
+	Mod1     Modifier = (1 << 3)
+	Mod2     Modifier = (1 << 4)
+	Mod3     Modifier = (1 << 5)
+	Mod4     Modifier = (1 << 6)
+	Mod5     Modifier = (1 << 7)
 )
 
 // Key represents a key.