diff --git a/src/panfrost/bifrost/bifrost_compile.c b/src/panfrost/bifrost/bifrost_compile.c
index 413c8d3f2c8..d4acad74852 100644
--- a/src/panfrost/bifrost/bifrost_compile.c
+++ b/src/panfrost/bifrost/bifrost_compile.c
@@ -805,9 +805,13 @@ emit_alu(bi_context *ctx, nir_alu_instr *instr)
                 break;
         case nir_op_iadd:
                 alu.op.imath = BI_IMATH_ADD;
+                /* Carry */
+                alu.src[2] = BIR_INDEX_ZERO;
                 break;
         case nir_op_isub:
                 alu.op.imath = BI_IMATH_SUB;
+                /* Borrow */
+                alu.src[2] = BIR_INDEX_ZERO;
                 break;
         case nir_op_iabs:
                 alu.op.special = BI_SPECIAL_IABS;
diff --git a/src/panfrost/bifrost/test/bi_test_pack.c b/src/panfrost/bifrost/test/bi_test_pack.c
index 9a9f991ad72..a84eed4cdfd 100644
--- a/src/panfrost/bifrost/test/bi_test_pack.c
+++ b/src/panfrost/bifrost/test/bi_test_pack.c
@@ -557,6 +557,7 @@ bit_imath_helper(struct panfrost_device *dev, uint32_t *input, unsigned size, en
 {
         bi_instruction ins = bit_ins(BI_IMATH, 2, nir_type_uint, size);
         bit_swizzle_identity(&ins, 2, size);
+        ins.src[2] = BIR_INDEX_ZERO; /* carry/borrow for FMA */
 
         for (unsigned op = BI_IMATH_ADD; op <= BI_IMATH_SUB; ++op) {
                 ins.op.imath = op;