diff --git a/src/input.c b/src/input.c
index 9c109cb..6c3cf9c 100644
--- a/src/input.c
+++ b/src/input.c
@@ -265,15 +265,23 @@ static void input_keyConvDestroy(void) {
 SDLKey input_keyConv(char* name) {
   SDLKey k;
   size_t l;
-  char buf[2];
+  char buf;
+  int m;
 
   l = strlen(name);
-  buf[0] = tolower(name[0]);
-  buf[1] = '\0';
+  buf = tolower(name[0]);
 
-  for(k = 0; k < INPUT_NUMKEYS; k++)
-    if(strcmp((l==1) ? buf : name, keyconv[k])==0)
-      return k;
+  /* Compare for single character. */
+  if(l == 1) {
+    m = MIN(256, INPUT_NUMKEYS);
+    for(k = 0; k < m; k++) /* Only valid for char range. */
+      if((buf == tolower(keyconv[k][0])) && (keyconv[k][1] == '\0'))
+        return k;
+  } else { /* Compare for strings. */
+    for(k = 0; k < INPUT_NUMKEYS; k++)
+      if(strcmp(name, keyconv[k])==0)
+        return k;
+  }
 
   WARN("Keyname '%s' doesn't match any key.", name);
   return SDLK_UNKNOWN;
diff --git a/src/opengl.c b/src/opengl.c
index 5fca21b..261ef1c 100644
--- a/src/opengl.c
+++ b/src/opengl.c
@@ -185,7 +185,7 @@ static int SDL_IsTrans(SDL_Surface* s, int x, int y) {
 static uint8_t* SDL_MapTrans(SDL_Surface* s) {
   int i, j;
   int size;
-  uint8* t;
+  Uint8* t;
 
   /* Allocate memory for just enough bits to hold all the data we need. */
   size = s->w*s->h/8 + ((s->w*s->h%8)?1:0);
diff --git a/src/options.c b/src/options.c
index 699a3d4..eead090 100644
--- a/src/options.c
+++ b/src/options.c
@@ -27,12 +27,30 @@
 /* Extern. */
 extern const char* keybindNames[]; /* From input.c */
 
+static int opt_isalpha(SDLKey k);
 static const char* modToText(SDLMod mod);
 static void menuKeybinds_update(unsigned int wid, char* name);
 
 static void opt_setSFXLevel(unsigned int wid, char* str);
 static void opt_setMusicLevel(unsigned int wid, char* str);
 
+/**
+ * @brief Check to see if a key is alpha.
+ *    @param k Key to check.
+ *    @return 1 if is alpha.
+ */
+static int opt_isalpha(SDLKey k) {
+  int ret;
+
+  ret = 0;
+
+  /* Alpha. */
+  if((k >= SDLK_a) && (k <= SDLK_z))
+    ret = 1;
+
+  return ret;
+}
+
 /**
  * @brief Opens the keybindings menu.
  */
@@ -66,7 +84,7 @@ void opt_menuKeybinds(void) {
     switch(type) {
       case KEYBIND_KEYBOARD:
         /* SDL_GetKeyName returns lowercase which is ugly. */
-        if(isalpha(key))
+        if(opt_isalpha(key))
           snprintf(str[j], 64, "%s <%c>", keybindNames[j], toupper(key));
         else
           snprintf(str[j], 64, "%s <%s>", keybindNames[j], SDL_GetKeyName(key));
@@ -147,7 +165,7 @@ static void menuKeybinds_update(unsigned int wid, char* name) {
       break;
     case KEYBIND_KEYBOARD:
       /* SDL_GetKeyName returns lowercase which is ugly. */
-      if(isalpha(key))
+      if(opt_isalpha(key))
         snprintf(bind, 32, "keyboard:   %s%s%c",
             (mod != KMOD_NONE) ? modToText(mod) : "",
             (mod != KMOD_NONE) ? " + " : "",
diff --git a/src/toolkit.c b/src/toolkit.c
index 0d2178b..d32d8c5 100644
--- a/src/toolkit.c
+++ b/src/toolkit.c
@@ -198,6 +198,8 @@ static void toolkit_clip(double x, double y, double w, double h);
 static void toolkit_unclip(void);
 static void toolkit_drawRect(double x, double y, double w, double h,
                              glColour* c, glColour* lc);
+/* Misc. */
+static int toolkit_isalnum(SDLKey k);
 
 /**
  * @brief Set the internal widget position.
@@ -2198,6 +2200,27 @@ static void toolkit_clearKey(void) {
   input_keyCounter = 0;
 }
 
+/**
+ * @brief Like isalnum but for keysyms.
+ *    @param k Key to check.
+ *    @return 1 if is alnum.
+ */
+static int toolkit_isalnum(SDLKey k) {
+  int ret;
+
+  ret = 0;
+
+  /* Alpha. */
+  if((k >= SDLK_a) && (k <= SDLK_z))
+    ret = 1;
+
+  /* Number. */
+  if((k >= SDLK_0) && (k <= SDLK_9))
+    ret = 1;
+
+  return ret;
+}
+
 /**
  * @brief Handles keyboard events.
  *    @param event Keyboard event to handle.
@@ -2217,7 +2240,7 @@ static int toolkit_keyEvent(SDL_Event* event) {
   key = event->key.keysym.sym;
 
   /* Hack to simulate key repetition. */
-  if((key == SDLK_BACKSPACE) || isalnum(key)) {
+  if((key == SDLK_BACKSPACE) || toolkit_isalnum(key)) {
     if(event->type == SDL_KEYDOWN)    toolkit_regKey(key);
     else if(event->type == SDL_KEYUP) toolkit_unregKey(key);
   }
@@ -2290,7 +2313,7 @@ void toolkit_update(void) {
     wdw = &windows[nwindows-1];
     wgt = (wdw->focus >= 0) ? &wdw->widgets[wdw->focus] : NULL;
     if(wgt && (wgt->type == WIDGET_INPUT) &&
-        (input_key == SDLK_BACKSPACE || isalnum(input_key)))
+        (input_key == SDLK_BACKSPACE || toolkit_isalnum(input_key)))
       toolkit_inputInput(SDL_KEYDOWN, wgt, input_key);
   }