diff --git a/bsd-core/drm_dma.c b/bsd-core/drm_dma.c
index 69c66c9a..0f0dd4fd 100644
--- a/bsd-core/drm_dma.c
+++ b/bsd-core/drm_dma.c
@@ -619,6 +619,7 @@ int DRM(wait_vblank)( DRM_IOCTL_ARGS )
 
 	if (vblwait.request.type & _DRM_VBLANK_RELATIVE) {
 		vblwait.request.sequence += atomic_read(&dev->vbl_received);
+		vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
 	}
 
 	flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK;
diff --git a/bsd/drm_dma.h b/bsd/drm_dma.h
index 69c66c9a..0f0dd4fd 100644
--- a/bsd/drm_dma.h
+++ b/bsd/drm_dma.h
@@ -619,6 +619,7 @@ int DRM(wait_vblank)( DRM_IOCTL_ARGS )
 
 	if (vblwait.request.type & _DRM_VBLANK_RELATIVE) {
 		vblwait.request.sequence += atomic_read(&dev->vbl_received);
+		vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
 	}
 
 	flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK;
diff --git a/libdrm/xf86drm.c b/libdrm/xf86drm.c
index 6c830664..d250365e 100644
--- a/libdrm/xf86drm.c
+++ b/libdrm/xf86drm.c
@@ -1105,6 +1105,7 @@ int drmWaitVBlank(int fd, drmVBlankPtr vbl)
 
     do {
        ret = ioctl(fd, DRM_IOCTL_WAIT_VBLANK, vbl);
+       vbl->request.type &= ~DRM_VBLANK_RELATIVE;
     } while (ret && errno == EINTR);
 
     return ret;
diff --git a/linux-core/drm_dma.c b/linux-core/drm_dma.c
index 33af34be..df4ed809 100644
--- a/linux-core/drm_dma.c
+++ b/linux-core/drm_dma.c
@@ -628,6 +628,7 @@ int DRM(wait_vblank)( DRM_IOCTL_ARGS )
 	switch ( vblwait.request.type & ~_DRM_VBLANK_FLAGS_MASK ) {
 	case _DRM_VBLANK_RELATIVE:
 		vblwait.request.sequence += atomic_read( &dev->vbl_received );
+		vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
 	case _DRM_VBLANK_ABSOLUTE:
 		break;
 	default:
diff --git a/linux/drm_dma.h b/linux/drm_dma.h
index 33af34be..df4ed809 100644
--- a/linux/drm_dma.h
+++ b/linux/drm_dma.h
@@ -628,6 +628,7 @@ int DRM(wait_vblank)( DRM_IOCTL_ARGS )
 	switch ( vblwait.request.type & ~_DRM_VBLANK_FLAGS_MASK ) {
 	case _DRM_VBLANK_RELATIVE:
 		vblwait.request.sequence += atomic_read( &dev->vbl_received );
+		vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
 	case _DRM_VBLANK_ABSOLUTE:
 		break;
 	default: