diff --git a/src/mesa/drivers/dri/i965/brw_fs_generator.cpp b/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
index b88dc8e63eb..3bfee7eb7de 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
@@ -1047,6 +1047,7 @@ fs_generator::generate_uniform_pull_constant_load_gen7(fs_inst *inst,
 
       brw_push_insn_state(p);
       brw_set_default_mask_control(p, BRW_MASK_DISABLE);
+      brw_set_default_exec_size(p, BRW_EXECUTE_8);
       brw_MOV(p, vec8(src), retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UD));
       brw_set_default_access_mode(p, BRW_ALIGN_1);
 
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp b/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp
index 09a509f909d..07b008f0c8f 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp
@@ -1100,6 +1100,7 @@ vec4_generator::generate_set_simd4x2_header_gen9(vec4_instruction *inst,
    brw_push_insn_state(p);
    brw_set_default_mask_control(p, BRW_MASK_DISABLE);
 
+   brw_set_default_exec_size(p, BRW_EXECUTE_8);
    brw_MOV(p, vec8(dst), retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UD));
 
    brw_set_default_access_mode(p, BRW_ALIGN_1);