diff --git a/src/compiler/nir/nir_lower_bool_to_bitsize.c b/src/compiler/nir/nir_lower_bool_to_bitsize.c
index e7414fbf3d9..703819560cc 100644
--- a/src/compiler/nir/nir_lower_bool_to_bitsize.c
+++ b/src/compiler/nir/nir_lower_bool_to_bitsize.c
@@ -110,7 +110,7 @@ lower_alu_instr(nir_builder *b, nir_alu_instr *alu)
    case nir_op_ior:
    case nir_op_ixor:
       if (nir_dest_bit_size(alu->dest.dest) > 1)
-         break; /* Not a boolean instruction */
+         return false; /* Not a boolean instruction */
       /* Fallthrough */
 
    case nir_op_ball_fequal2:
diff --git a/src/compiler/nir/nir_lower_bool_to_float.c b/src/compiler/nir/nir_lower_bool_to_float.c
index 0dd69c958f9..32f2ca056b2 100644
--- a/src/compiler/nir/nir_lower_bool_to_float.c
+++ b/src/compiler/nir/nir_lower_bool_to_float.c
@@ -58,6 +58,8 @@ lower_alu_instr(nir_builder *b, nir_alu_instr *alu)
    case nir_op_vec4:
    case nir_op_vec8:
    case nir_op_vec16:
+      if (alu->dest.dest.ssa.bit_size != 1)
+         return false;
       /* These we expect to have booleans but the opcode doesn't change */
       break;
 
diff --git a/src/compiler/nir/nir_lower_bool_to_int32.c b/src/compiler/nir/nir_lower_bool_to_int32.c
index 1ea8d12cb21..706f5d6ef8d 100644
--- a/src/compiler/nir/nir_lower_bool_to_int32.c
+++ b/src/compiler/nir/nir_lower_bool_to_int32.c
@@ -59,6 +59,8 @@ lower_alu_instr(nir_alu_instr *alu)
    case nir_op_iand:
    case nir_op_ior:
    case nir_op_ixor:
+      if (alu->dest.dest.ssa.bit_size != 1)
+         return false;
       /* These we expect to have booleans but the opcode doesn't change */
       break;