diff --git a/include/glez.h b/include/glez.h
index 5516f16..c57aa6c 100644
--- a/include/glez.h
+++ b/include/glez.h
@@ -47,7 +47,7 @@ void glez_resize(int width, int height);
 
 /* Helper functions */
 
-glez_rgba_t glez_rgba(int r, int g, int b, int a);
+glez_rgba_t glez_rgba(unsigned char r, unsigned char g, unsigned char b, unsigned char a);
 
 /* Font-related functions */
 
diff --git a/src/draw.c b/src/draw.c
index 734a20f..feae7d9 100644
--- a/src/draw.c
+++ b/src/draw.c
@@ -26,7 +26,6 @@ void ds_destroy()
 
 void ds_pre_render()
 {
-    glClear(GL_COLOR_BUFFER_BIT);
     glPushAttrib(GL_CURRENT_BIT | GL_ENABLE_BIT | GL_TEXTURE_BIT |
                  GL_COLOR_BUFFER_BIT);
 
diff --git a/src/glez.c b/src/glez.c
index 036564b..cb36297 100644
--- a/src/glez.c
+++ b/src/glez.c
@@ -48,7 +48,7 @@ void glez_resize(int width, int height)
 
 /* Helper functions */
 
-glez_rgba_t glez_rgba(int r, int g, int b, int a)
+glez_rgba_t glez_rgba(unsigned char r, unsigned char g, unsigned char b, unsigned char a)
 {
     glez_rgba_t result;
     result.r = (float) r / 255.0f;