diff --git a/src/platform/3ds/gui-font.c b/src/platform/3ds/gui-font.c
index bd241cb92..3b20b5304 100644
--- a/src/platform/3ds/gui-font.c
+++ b/src/platform/3ds/gui-font.c
@@ -35,7 +35,7 @@ void GUIFontDestroy(struct GUIFont* font) {
 	free(font);
 }
 
-int GUIFontHeight(const struct GUIFont* font) {
+unsigned GUIFontHeight(const struct GUIFont* font) {
 	UNUSED(font);
 	return GLYPH_HEIGHT;
 }
diff --git a/src/platform/psp2/gui-font.c b/src/platform/psp2/gui-font.c
index 919b062dc..2a916bb3d 100644
--- a/src/platform/psp2/gui-font.c
+++ b/src/platform/psp2/gui-font.c
@@ -31,7 +31,7 @@ void GUIFontDestroy(struct GUIFont* font) {
 	free(font);
 }
 
-int GUIFontHeight(const struct GUIFont* font) {
+unsigned GUIFontHeight(const struct GUIFont* font) {
 	UNUSED(font);
 	return GLYPH_HEIGHT;
 }
diff --git a/src/platform/wii/gui-font.c b/src/platform/wii/gui-font.c
index 57129a5da..51ab7aeda 100644
--- a/src/platform/wii/gui-font.c
+++ b/src/platform/wii/gui-font.c
@@ -39,7 +39,7 @@ void GUIFontDestroy(struct GUIFont* font) {
 	free(font);
 }
 
-int GUIFontHeight(const struct GUIFont* font) {
+unsigned GUIFontHeight(const struct GUIFont* font) {
 	UNUSED(font);
 	return GLYPH_HEIGHT;
 }
diff --git a/src/util/gui.h b/src/util/gui.h
index f2d267655..a77b71d9e 100644
--- a/src/util/gui.h
+++ b/src/util/gui.h
@@ -25,8 +25,8 @@ enum GUIInput {
 };
 
 struct GUIParams {
-	int width;
-	int height;
+	unsigned width;
+	unsigned height;
 	const struct GUIFont* font;
 
 	void (*drawStart)(void);
diff --git a/src/util/gui/file-select.c b/src/util/gui/file-select.c
index b81b27ec3..66b031e5d 100644
--- a/src/util/gui/file-select.c
+++ b/src/util/gui/file-select.c
@@ -168,7 +168,7 @@ bool selectFile(const struct GUIParams* params, const char* basePath, char* outP
 		}
 
 		params->drawStart();
-		int y = GUIFontHeight(params->font);
+		unsigned y = GUIFontHeight(params->font);
 		GUIFontPrintf(params->font, 0, y, GUI_TEXT_LEFT, 0xFFFFFFFF, "%s", currentPath);
 		y += 2 * GUIFontHeight(params->font);
 		size_t i;
diff --git a/src/util/gui/font.h b/src/util/gui/font.h
index 3679687fe..ed666fcfa 100644
--- a/src/util/gui/font.h
+++ b/src/util/gui/font.h
@@ -29,7 +29,7 @@ struct GUIFontGlyphMetric {
 	} padding;
 };
 
-int GUIFontHeight(const struct GUIFont*);
+unsigned GUIFontHeight(const struct GUIFont*);
 
 void GUIFontPrintf(const struct GUIFont*, int x, int y, enum GUITextAlignment, uint32_t color, const char* text, ...);