diff --git a/readchar/_base_key.py b/readchar/_base_key.py
new file mode 100644
index 0000000..6011b6c
--- /dev/null
+++ b/readchar/_base_key.py
@@ -0,0 +1,34 @@
+# common
+LF = "\x0a"
+CR = "\x0d"
+SPACE = "\x20"
+ESC = "\x1b"
+TAB = "\x09"
+
+# CTRL
+CTRL_A = "\x01"
+CTRL_B = "\x02"
+CTRL_C = "\x03"
+CTRL_D = "\x04"
+CTRL_E = "\x05"
+CTRL_F = "\x06"
+CTRL_G = "\x07"
+CTRL_H = "\x08"
+CTRL_I = TAB
+CTRL_J = LF
+CTRL_K = "\x0b"
+CTRL_L = "\x0c"
+CTRL_M = CR
+CTRL_N = "\x0e"
+CTRL_O = "\x0f"
+CTRL_P = "\x10"
+CTRL_Q = "\x11"
+CTRL_R = "\x12"
+CTRL_S = "\x13"
+CTRL_T = "\x14"
+CTRL_U = "\x15"
+CTRL_V = "\x16"
+CTRL_W = "\x17"
+CTRL_X = "\x18"
+CTRL_Y = "\x19"
+CTRL_Z = "\x1a"
diff --git a/readchar/_posix_key.py b/readchar/_posix_key.py
index 350d60d..5b2d74b 100644
--- a/readchar/_posix_key.py
+++ b/readchar/_posix_key.py
@@ -1,39 +1,8 @@
+from ._base_key import *
+
+
 # common
-LF = "\x0a"
-CR = "\x0d"
-ENTER = LF
 BACKSPACE = "\x7f"
-SPACE = "\x20"
-ESC = "\x1b"
-TAB = "\x09"
-
-# CTRL
-CTRL_A = "\x01"
-CTRL_B = "\x02"
-CTRL_C = "\x03"
-CTRL_D = "\x04"
-CTRL_E = "\x05"
-CTRL_F = "\x06"
-CTRL_G = "\x07"
-CTRL_H = "\x08"
-CTRL_I = TAB
-CTRL_J = LF
-CTRL_K = "\x0b"
-CTRL_L = "\x0c"
-CTRL_M = CR
-CTRL_N = "\x0e"
-CTRL_O = "\x0f"
-CTRL_P = "\x10"
-CTRL_Q = "\x11"
-CTRL_R = "\x12"
-CTRL_S = "\x13"
-CTRL_T = "\x14"
-CTRL_U = "\x15"
-CTRL_V = "\x16"
-CTRL_W = "\x17"
-CTRL_X = "\x18"
-CTRL_Y = "\x19"
-CTRL_Z = "\x1a"
 
 # cursors
 UP = "\x1b\x5b\x41"
@@ -44,7 +13,6 @@
 # navigation keys
 INSERT = "\x1b\x5b\x32\x7e"
 SUPR = "\x1b\x5b\x33\x7e"
-DELETE = SUPR
 HOME = "\x1b\x5b\x48"
 END = "\x1b\x5b\x46"
 PAGE_UP = "\x1b\x5b\x35\x7e"
@@ -75,3 +43,8 @@
 
 # CTRL+ALT+_
 CTRL_ALT_A = "\x1b\x01"
+
+
+# aliases
+ENTER = LF
+DELETE = SUPR
diff --git a/readchar/_win_key.py b/readchar/_win_key.py
index 433f545..f02934a 100644
--- a/readchar/_win_key.py
+++ b/readchar/_win_key.py
@@ -1,39 +1,5 @@
-# common
-LF = "\x0a"
-CR = "\x0d"
-ENTER = CR
-BACKSPACE = "\x08"
-SPACE = "\x20"
-ESC = "\x1b"
-TAB = "\x09"
+from ._base_key import *
 
-# CTRL
-CTRL_A = "\x01"
-CTRL_B = "\x02"
-CTRL_C = "\x03"
-CTRL_D = "\x04"
-CTRL_E = "\x05"
-CTRL_F = "\x06"
-CTRL_G = "\x07"
-CTRL_H = BACKSPACE
-CTRL_I = TAB
-CTRL_J = LF
-CTRL_K = "\x0b"
-CTRL_L = "\x0c"
-CTRL_M = CR
-CTRL_N = "\x0e"
-CTRL_O = "\x0f"
-CTRL_P = "\x10"
-CTRL_Q = "\x11"
-CTRL_R = "\x12"
-CTRL_S = "\x13"
-CTRL_T = "\x14"
-CTRL_U = "\x15"
-CTRL_V = "\x16"
-CTRL_W = "\x17"
-CTRL_X = "\x18"
-CTRL_Y = "\x19"
-CTRL_Z = "\x1a"
 
 # Windows uses scan codes for extended characters. This dictionary
 # translates the second half of the scan codes of special Keys
@@ -44,6 +10,9 @@
 #      or
 #   https://www.freepascal.org/docs-html/rtl/keyboard/kbdscancode.html
 
+# common
+BACKSPACE = "\x08"
+
 # cursors
 UP = "\x00\x48"
 DOWN = "\x00\x50"
@@ -53,7 +22,6 @@
 # navigation keys
 INSERT = "\x00\x52"
 SUPR = "\x00\x53"
-DELETE = SUPR
 HOME = "\x00\x47"
 END = "\x00\x4f"
 PAGE_UP = "\x00\x49"
@@ -82,3 +50,8 @@
 # CTRL_ALT_[A-Z],
 # CTRL_ALT_SUPR,
 # CTRL-F1
+
+
+# aliases
+ENTER = CR
+DELETE = SUPR
diff --git a/setup.cfg b/setup.cfg
index 80e3309..bdbf88d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -67,6 +67,8 @@ exclude =
 show-source = true
 statistics = true
 count = true
+per-file-ignores =
+    readchar/*_key.py:F403,F405
 
 [tool.coverage.run]
 omit = tests/*