diff --git a/src/compiler/nir/nir_instr_set.c b/src/compiler/nir/nir_instr_set.c
index 032fcbcb918..985db65c0a1 100644
--- a/src/compiler/nir/nir_instr_set.c
+++ b/src/compiler/nir/nir_instr_set.c
@@ -707,6 +707,14 @@ nir_instrs_equal(const nir_instr *instr1, const nir_instr *instr2)
       if (phi1->instr.block != phi2->instr.block)
          return false;
 
+      /* In case of phis with no sources, the dest needs to be checked
+       * to ensure that phis with incompatible dests won't get merged
+       * during CSE. */
+      if (phi1->dest.ssa.num_components != phi2->dest.ssa.num_components)
+         return false;
+      if (phi1->dest.ssa.bit_size != phi2->dest.ssa.bit_size)
+         return false;
+
       nir_foreach_phi_src(src1, phi1) {
          nir_foreach_phi_src(src2, phi2) {
             if (src1->pred == src2->pred) {