diff --git a/src/ui48_bitmaps_big_font.h b/src/ui48_bitmaps_big_font.h
index 85b8c46..88e8fc3 100644
--- a/src/ui48_bitmaps_big_font.h
+++ b/src/ui48_bitmaps_big_font.h
@@ -1,5 +1,5 @@
-#ifndef _UI_BIG_FONT_H
-#define _UI_BIG_FONT_H 1
+#ifndef _UI48_BITMAPS_BIG_FONT_H
+#define _UI48_BITMAPS_BIG_FONT_H 1
 
 #define big_font_dot_width 8
 #define big_font_dot_height 13
@@ -169,4 +169,4 @@ static unsigned char big_font_X_bits[] = {
     51, 51, 30, 30, 12, 12, 30, 30, 51, 51,
 };
 
-#endif /* _UI_BIG_FONT_H 1 */
+#endif /* _UI48_BITMAPS_BIG_FONT_H 1 */
diff --git a/src/ui48_bitmaps_misc.h b/src/ui48_bitmaps_misc.h
index 4335d8f..b87be0a 100644
--- a/src/ui48_bitmaps_misc.h
+++ b/src/ui48_bitmaps_misc.h
@@ -1,5 +1,5 @@
-#ifndef _UI_BITMAPS_H
-#define _UI_BITMAPS_H 1
+#ifndef _UI48_BITMAPS_MISC_H
+#define _UI48_BITMAPS_MISC_H 1
 
 #define hp_width 96
 #define hp_height 24
@@ -221,4 +221,4 @@ static unsigned char last_bitmap[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10,
                                        0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x29, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80,
                                        0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0xc9, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80 };
 
-#endif /* _UI_BITMAPS_H 1 */
+#endif /* _UI48_BITMAPS_MISC_H 1 */
diff --git a/src/ui48_bitmaps_small_font.h b/src/ui48_bitmaps_small_font.h
index 0a46923..4308510 100644
--- a/src/ui48_bitmaps_small_font.h
+++ b/src/ui48_bitmaps_small_font.h
@@ -1,5 +1,5 @@
-#ifndef _UI_SMALL_FONT_H
-#define _UI_SMALL_FONT_H 1
+#ifndef _UI48_BITMAPS_SMALL_FONT_H
+#define _UI48_BITMAPS_SMALL_FONT_H 1
 
 #define blank_width 4
 #define blank_height 7
@@ -420,4 +420,4 @@ static unsigned char arrow_gx_bits[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0
 #define equal_gx_height 12
 static unsigned char equal_gx_bits[] = { 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00 };
 
-#endif /* _UI_SMALL_FONT_H 1 */
+#endif /* _UI48_BITMAPS_SMALL_FONT_H 1 */
diff --git a/src/ui48_common.h b/src/ui48_common.h
index d9a9e47..6cd00f8 100644
--- a/src/ui48_common.h
+++ b/src/ui48_common.h
@@ -1,5 +1,5 @@
-#ifndef _UI_H
-#define _UI_H 1
+#ifndef _UI48_COMMON_H
+#define _UI48_COMMON_H 1
 
 #include "ui48_config.h"
 
@@ -15,4 +15,4 @@ extern void ( *ui_stop )( void );
 extern void setup_ui( config_t* config );
 extern void close_and_exit( void );
 
-#endif /* !_UI_H */
+#endif /* !_UI48_COMMON_H */
diff --git a/src/ui48_config.h b/src/ui48_config.h
index a861a5a..91e92da 100644
--- a/src/ui48_config.h
+++ b/src/ui48_config.h
@@ -1,5 +1,5 @@
-#ifndef _CONFIG_H
-#define _CONFIG_H 1
+#ifndef _UI48_CONFIG_H
+#define _UI48_CONFIG_H 1
 
 #include <stdbool.h>
 
@@ -38,4 +38,4 @@ typedef struct {
 /*************/
 extern config_t* config_init( int argc, char* argv[] );
 
-#endif /* !_CONFIG_H */
+#endif /* !_UI48_CONFIG_H */
diff --git a/src/ui48_inner.h b/src/ui48_inner.h
index afd99d8..22ef4cf 100644
--- a/src/ui48_inner.h
+++ b/src/ui48_inner.h
@@ -1,5 +1,5 @@
-#ifndef _UI_INNER_H
-#define _UI_INNER_H 1
+#ifndef _UI48_INNER_H
+#define _UI48_INNER_H 1
 
 #include "emulator.h"
 
@@ -90,4 +90,4 @@ extern button_t buttons_gx[ NB_KEYS ];
 extern int SmallTextWidth( const char* string, unsigned int length );
 extern int BigTextWidth( const char* string, unsigned int length );
 
-#endif /* _UI_INNER_H */
+#endif /* _UI48_INNER_H */
diff --git a/src/ui48_ncurses.h b/src/ui48_ncurses.h
index a27c006..c914649 100644
--- a/src/ui48_ncurses.h
+++ b/src/ui48_ncurses.h
@@ -1,6 +1,6 @@
-#ifndef _UI_NCURSES_H
-#define _UI_NCURSES_H 1
+#ifndef _UI48_NCURSES_H
+#define _UI48_NCURSES_H 1
 
 extern void setup_frontend_ncurses( void );
 
-#endif /* _UI_NCURSES_H */
+#endif /* _UI48_NCURSES_H */
diff --git a/src/ui48_sdl2.h b/src/ui48_sdl2.h
index e7bc233..e2fefc2 100644
--- a/src/ui48_sdl2.h
+++ b/src/ui48_sdl2.h
@@ -1,6 +1,6 @@
-#ifndef _UI_SDL2_H
-#define _UI_SDL2_H 1
+#ifndef _UI48_SDL2_H
+#define _UI48_SDL2_H 1
 
 extern void setup_frontend_sdl( void );
 
-#endif /* _UI_SDL2_H */
+#endif /* _UI48_SDL2_H */