diff --git a/src/Graphics_GL1.c b/src/Graphics_GL1.c
index 01b3e6e7e..a8d5fc9bf 100644
--- a/src/Graphics_GL1.c
+++ b/src/Graphics_GL1.c
@@ -207,27 +207,27 @@ void Gfx_SetDynamicVbData(GfxResourceID vb, void* vertices, int vCount) {
 #define IB_PTR NULL
 
 static void GL_SetupVbColoured(void) {
-	_glVertexPointer(3, GL_FLOAT,        SIZEOF_VERTEX_COLOURED, VB_PTR +  0);
-	_glColorPointer(4, GL_UNSIGNED_BYTE, SIZEOF_VERTEX_COLOURED, VB_PTR + 12);
+	_glVertexPointer(3, GL_FLOAT,        SIZEOF_VERTEX_COLOURED, (GLpointer)(VB_PTR +  0));
+	_glColorPointer(4, GL_UNSIGNED_BYTE, SIZEOF_VERTEX_COLOURED, (GLpointer)(VB_PTR + 12));
 }
 
 static void GL_SetupVbTextured(void) {
-	_glVertexPointer(3, GL_FLOAT,        SIZEOF_VERTEX_TEXTURED, VB_PTR +  0);
-	_glColorPointer(4, GL_UNSIGNED_BYTE, SIZEOF_VERTEX_TEXTURED, VB_PTR + 12);
-	_glTexCoordPointer(2, GL_FLOAT,      SIZEOF_VERTEX_TEXTURED, VB_PTR + 16);
+	_glVertexPointer(3, GL_FLOAT,        SIZEOF_VERTEX_TEXTURED, (GLpointer)(VB_PTR +  0));
+	_glColorPointer(4, GL_UNSIGNED_BYTE, SIZEOF_VERTEX_TEXTURED, (GLpointer)(VB_PTR + 12));
+	_glTexCoordPointer(2, GL_FLOAT,      SIZEOF_VERTEX_TEXTURED, (GLpointer)(VB_PTR + 16));
 }
 
 static void GL_SetupVbColoured_Range(int startVertex) {
 	cc_uint32 offset = startVertex * SIZEOF_VERTEX_COLOURED;
-	_glVertexPointer(3, GL_FLOAT,          SIZEOF_VERTEX_COLOURED, VB_PTR + offset +  0);
-	_glColorPointer(4, GL_UNSIGNED_BYTE,   SIZEOF_VERTEX_COLOURED, VB_PTR + offset + 12);
+	_glVertexPointer(3, GL_FLOAT,          SIZEOF_VERTEX_COLOURED, (GLpointer)(VB_PTR + offset +  0));
+	_glColorPointer(4, GL_UNSIGNED_BYTE,   SIZEOF_VERTEX_COLOURED, (GLpointer)(VB_PTR + offset + 12));
 }
 
 static void GL_SetupVbTextured_Range(int startVertex) {
 	cc_uint32 offset = startVertex * SIZEOF_VERTEX_TEXTURED;
-	_glVertexPointer(3,  GL_FLOAT,         SIZEOF_VERTEX_TEXTURED, VB_PTR + offset +  0);
-	_glColorPointer(4, GL_UNSIGNED_BYTE,   SIZEOF_VERTEX_TEXTURED, VB_PTR + offset + 12);
-	_glTexCoordPointer(2, GL_FLOAT,        SIZEOF_VERTEX_TEXTURED, VB_PTR + offset + 16);
+	_glVertexPointer(3,  GL_FLOAT,         SIZEOF_VERTEX_TEXTURED, (GLpointer)(VB_PTR + offset +  0));
+	_glColorPointer(4, GL_UNSIGNED_BYTE,   SIZEOF_VERTEX_TEXTURED, (GLpointer)(VB_PTR + offset + 12));
+	_glTexCoordPointer(2, GL_FLOAT,        SIZEOF_VERTEX_TEXTURED, (GLpointer)(VB_PTR + offset + 16));
 }
 
 void Gfx_SetVertexFormat(VertexFormat fmt) {
@@ -267,9 +267,9 @@ void Gfx_DrawVb_IndexedTris(int verticesCount) {
 
 void Gfx_DrawIndexedTris_T2fC4b(int verticesCount, int startVertex) {
 	cc_uint32 offset = startVertex * SIZEOF_VERTEX_TEXTURED;
-	_glVertexPointer(3, GL_FLOAT,        SIZEOF_VERTEX_TEXTURED, VB_PTR + offset +  0);
-	_glColorPointer(4, GL_UNSIGNED_BYTE, SIZEOF_VERTEX_TEXTURED, VB_PTR + offset + 12);
-	_glTexCoordPointer(2, GL_FLOAT,      SIZEOF_VERTEX_TEXTURED, VB_PTR + offset + 16);
+	_glVertexPointer(3, GL_FLOAT,        SIZEOF_VERTEX_TEXTURED, (GLpointer)(VB_PTR + offset +  0));
+	_glColorPointer(4, GL_UNSIGNED_BYTE, SIZEOF_VERTEX_TEXTURED, (GLpointer)(VB_PTR + offset + 12));
+	_glTexCoordPointer(2, GL_FLOAT,      SIZEOF_VERTEX_TEXTURED, (GLpointer)(VB_PTR + offset + 16));
 	_glDrawElements(GL_TRIANGLES,        ICOUNT(verticesCount),  GL_UNSIGNED_SHORT, IB_PTR);
 }
 
@@ -585,7 +585,7 @@ static void APIENTRY gl10_colorPointer(GLint size, GLenum type, GLsizei stride,
 static void APIENTRY gl10_texCoordPointer(GLint size, GLenum type, GLsizei stride, GLpointer offset) {
 }
 static void APIENTRY gl10_vertexPointer(GLint size, GLenum type, GLsizei stride, GLpointer offset) {
-	gl10_vb = cur_vb->data + offset;
+	gl10_vb = cur_vb->data + (cc_uintptr)offset;
 }