diff --git a/include/d3drmdef.h b/include/d3drmdef.h
index 19fb15c..73c661f 100644
--- a/include/d3drmdef.h
+++ b/include/d3drmdef.h
@@ -54,6 +54,7 @@
 LPD3DVECTOR WINAPI D3DRMVectorScale(LPD3DVECTOR, LPD3DVECTOR, D3DVALUE);
 LPD3DVECTOR WINAPI D3DRMVectorSubtract(LPD3DVECTOR, LPD3DVECTOR, LPD3DVECTOR);
 
+D3DVALUE WINAPI D3DRMColorGetBlue(D3DCOLOR);
 D3DVALUE WINAPI D3DRMColorGetGreen(D3DCOLOR);
 D3DVALUE WINAPI D3DRMColorGetRed(D3DCOLOR);