diff --git a/src/GUI/SafeTexFont.cxx b/src/GUI/SafeTexFont.cxx
index e40f4898b..0fcfc6e47 100644
--- a/src/GUI/SafeTexFont.cxx
+++ b/src/GUI/SafeTexFont.cxx
@@ -26,7 +26,7 @@ int SafeTexFont::load(const char *fname, GLenum mag, GLenum min)
 {
     struct stat buf;
     if (stat(fname, &buf) == -1) {
-        _status = ERROR;
+        _status = e_ERROR;
         return FNT_FALSE;
     }
     _name = fname;
@@ -37,16 +37,16 @@ int SafeTexFont::load(const char *fname, GLenum mag, GLenum min)
 
 bool SafeTexFont::ensureTextureLoaded()
 {
-    if (_status != ERROR) {
-        if (_status == LOADED) {
+    if (_status != e_ERROR) {
+        if (_status == e_LOADED) {
             return true;
         } else {
             int loadStatus = fntTexFont::load(_name.c_str(), _mag, _min);
             if (loadStatus == FNT_TRUE) {
-                _status = LOADED;
+                _status = e_LOADED;
                 return true;
             } else {
-                _status = ERROR;
+                _status = e_ERROR;
                 _error = ulGetError();
                 return false;
             }    
diff --git a/src/GUI/SafeTexFont.hxx b/src/GUI/SafeTexFont.hxx
index c1ca71801..0e6397c8b 100644
--- a/src/GUI/SafeTexFont.hxx
+++ b/src/GUI/SafeTexFont.hxx
@@ -31,7 +31,7 @@ namespace flightgear
 class SafeTexFont : public fntTexFont
 {
 public:
-    SafeTexFont() : _status(NOT_LOADED) {}
+    SafeTexFont() : _status(e_NOT_LOADED) {}
     /** Load the texture for this font.
      * @param mag OpenGL texture magnification; default is GL_NEAREST
      * @param min OpenGL texture minification; default is
@@ -46,9 +46,9 @@ public:
     void puts(sgVec3 curpos, float pointsize, float italic, const char *s);
     enum FontStatus
     {
-        ERROR = -1,
-        NOT_LOADED = 0,
-        LOADED = 1
+        e_ERROR = -1,
+        e_NOT_LOADED = 0,
+        e_LOADED = 1
     };
     FontStatus getStatus() { return _status; }
     std::string& fntError() { return _error; }