diff --git a/src/mesa/drivers/dri/i965/brw_disasm.c b/src/mesa/drivers/dri/i965/brw_disasm.c
index 17784198c69..5600a2b336a 100644
--- a/src/mesa/drivers/dri/i965/brw_disasm.c
+++ b/src/mesa/drivers/dri/i965/brw_disasm.c
@@ -254,6 +254,7 @@ static const char *const three_source_reg_encoding[] = {
    [BRW_3SRC_TYPE_F]  = "F",
    [BRW_3SRC_TYPE_D]  = "D",
    [BRW_3SRC_TYPE_UD] = "UD",
+   [BRW_3SRC_TYPE_DF] = "DF",
 };
 
 const int reg_type_size[] = {