diff --git a/src/include/keycodes.h b/src/include/keycodes.h
index ba54739..e372ff4 100644
--- a/src/include/keycodes.h
+++ b/src/include/keycodes.h
@@ -64,7 +64,9 @@
     f(KEY_GRAVE     ,  53, ""  , NULL, MODIFIERS_NONE ) \
     f(KEY_DOT       ,  55, "." , ">" , MODIFIERS_SHIFT) \
     f(KEY_SLASH     ,  56, "/" , "?" , MODIFIERS_SHIFT) \
-    f(KEY_CAPS      ,  57, ""  , NULL, MODIFIERS_NONE )
+    f(KEY_CAPS      ,  57, ""  , NULL, MODIFIERS_NONE ) \
+    f(KEY_LEFT_SHIFT,  225, NULL, NULL, MODIFIERS_NONE) \
+    f(KEY_RIGHT_SHIFT, 229, NULL, NULL, MODIFIERS_NONE)
 
 #define KEY_ENUM(name, id, normal, modified, modifiers) name = id,
 

diff --git a/src/include/keycodes.h b/src/include/keycodes.h
index ba54739..e372ff4 100644
--- a/src/include/keycodes.h
+++ b/src/include/keycodes.h
@@ -64,7 +64,9 @@
     f(KEY_GRAVE     ,  53, ""  , NULL, MODIFIERS_NONE ) \
     f(KEY_DOT       ,  55, "." , ">" , MODIFIERS_SHIFT) \
     f(KEY_SLASH     ,  56, "/" , "?" , MODIFIERS_SHIFT) \
-    f(KEY_CAPS      ,  57, ""  , NULL, MODIFIERS_NONE )
+    f(KEY_CAPS      ,  57, ""  , NULL, MODIFIERS_NONE ) \
+    f(KEY_LEFT_SHIFT,  225, NULL, NULL, MODIFIERS_NONE) \
+    f(KEY_RIGHT_SHIFT, 229, NULL, NULL, MODIFIERS_NONE)
 
 #define KEY_ENUM(name, id, normal, modified, modifiers) name = id,
 
diff --git a/src/userland/ps2kb/main.c b/src/userland/ps2kb/main.c
index 8b74e77..7fd96c4 100644
--- a/src/userland/ps2kb/main.c
+++ b/src/userland/ps2kb/main.c
@@ -2,13 +2,11 @@
 #include <keycodes.h>
 #include <stdint.h>
 
-const char modifierScancodes[] = {0x2A, 0x36, 0x1D, 0x9D};
-
 uint32_t keycodes[128] = { 
     0,   27,   KEY_1,  KEY_2, KEY_3,  KEY_4, KEY_5, KEY_6, KEY_7, KEY_8, KEY_9, KEY_0, KEY_MINUS,
     KEY_EQUALS, KEY_DELETE, KEY_TAB, KEY_Q, KEY_W,  KEY_E, KEY_R, KEY_T, KEY_Y, KEY_U, KEY_I, KEY_O, KEY_P,
     KEY_BRACEOPEN, KEY_BRACECLOSE,  KEY_RETURN, 0,  KEY_A, KEY_S, KEY_D, KEY_F, KEY_G, KEY_H, KEY_J, KEY_K, KEY_L,
-    KEY_SEMICOLON, KEY_APOSTROPHE, /*backtick*/0,  0, KEY_BACKSLASH, KEY_Z, KEY_X, KEY_C, KEY_V, KEY_B, KEY_N, KEY_M, /*comma*/ 0,
+    KEY_SEMICOLON, KEY_APOSTROPHE, /*backtick*/0,  KEY_LEFT_SHIFT, KEY_BACKSLASH, KEY_Z, KEY_X, KEY_C, KEY_V, KEY_B, KEY_N, KEY_M, /*comma*/ 0,
     KEY_DOT, KEY_SLASH,  0, /* asterisk */0, 0, KEY_SPACEBAR, 0,   0,   0,   0,   0,   0,   0,
     0,   0,    0,    0,   0,    0,   0,   0,   0,   KEY_MINUS, 0,   0,   0,
     /*KEY_PLUS*/0, 0,    0,    0,   0,    0,   0,   0,   0,   0,   0,   0};
@@ -46,7 +44,6 @@
         return;
     } else {
         keyDown(keycodes[scancode], 0);
-        keyUp(keycodes[scancode], 0);
     }
 }
 
@@ -56,4 +53,4 @@
 
 int32_t main() {
     createFunction("register", (void *)doRegister);
-}
\ No newline at end of file
+}