diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_program.c b/src/gallium/drivers/nouveau/nvc0/nvc0_program.c
index 36d0f7017c7..38082b8e203 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_program.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_program.c
@@ -686,7 +686,7 @@ nvc0_program_translate(struct nvc0_program *prog, uint16_t chipset,
    prog->relocs = info_out.bin.relocData;
    prog->fixups = info_out.bin.fixupData;
    if (info_out.target >= NVISA_GV100_CHIPSET)
-      prog->num_gprs = MIN2(info_out.bin.maxGPR + 5, 256); //XXX: why?
+      prog->num_gprs = MIN2(info_out.bin.maxGPR + 5, 255); //XXX: why?
    else
       prog->num_gprs = MAX2(4, (info_out.bin.maxGPR + 1));
    prog->cp.smem_size = info_out.bin.smemSize;