diff --git a/src/osd/sdl/osdsdl.h b/src/osd/sdl/osdsdl.h
index 177fc7cf7d9..f709aa40c6a 100644
--- a/src/osd/sdl/osdsdl.h
+++ b/src/osd/sdl/osdsdl.h
@@ -170,7 +170,7 @@ public:
 
 	// OpenGL specific options
 	bool filter() const { return bool_value(SDLOPTION_FILTER); }
-	int prescale() const { return bool_value(SDLOPTION_PRESCALE); }
+	int prescale() const { return int_value(SDLOPTION_PRESCALE); }
 	bool gl_force_pow2_texture() const { return bool_value(SDLOPTION_GL_FORCEPOW2TEXTURE); }
 	bool gl_no_texture_rect() const { return bool_value(SDLOPTION_GL_NOTEXTURERECT); }
 	bool gl_vbo() const { return bool_value(SDLOPTION_GL_VBO); }