diff --git a/src/compiler/nir/nir_opt_constant_folding.c b/src/compiler/nir/nir_opt_constant_folding.c
index 2ff1135c980..2d9b1daa9fc 100644
--- a/src/compiler/nir/nir_opt_constant_folding.c
+++ b/src/compiler/nir/nir_opt_constant_folding.c
@@ -39,7 +39,7 @@ struct constant_fold_state {
 static bool
 try_fold_alu(nir_builder *b, nir_alu_instr *alu)
 {
-   nir_const_value src[NIR_MAX_VEC_COMPONENTS][NIR_MAX_VEC_COMPONENTS];
+   nir_const_value src[NIR_ALU_MAX_INPUTS][NIR_MAX_VEC_COMPONENTS];
 
    /* In the case that any outputs/inputs have unsized types, then we need to
     * guess the bit-size. In this case, the validator ensures that all