diff --git a/libs/vkd3d-shader/d3dbc.c b/libs/vkd3d-shader/d3dbc.c
index 3b935b07..1be36a5b 100644
--- a/libs/vkd3d-shader/d3dbc.c
+++ b/libs/vkd3d-shader/d3dbc.c
@@ -2333,6 +2333,10 @@ static void write_sm1_expr(struct hlsl_ctx *ctx, struct vkd3d_bytecode_buffer *b
             }
             break;
 
+        case HLSL_OP2_LOGIC_OR:
+            write_sm1_binary_op(ctx, buffer, D3DSIO_MAX, &instr->reg, &arg1->reg, &arg2->reg);
+            break;
+
         case HLSL_OP2_SLT:
             if (ctx->profile->type == VKD3D_SHADER_TYPE_PIXEL)
                 hlsl_fixme(ctx, &instr->loc, "Lower SLT instructions for pixel shaders.");
diff --git a/libs/vkd3d-shader/hlsl_codegen.c b/libs/vkd3d-shader/hlsl_codegen.c
index fb7d1f56..95026eb8 100644
--- a/libs/vkd3d-shader/hlsl_codegen.c
+++ b/libs/vkd3d-shader/hlsl_codegen.c
@@ -3622,6 +3622,7 @@ static bool lower_nonfloat_exprs(struct hlsl_ctx *ctx, struct hlsl_ir_node *inst
         case HLSL_OP1_NEG:
         case HLSL_OP2_ADD:
         case HLSL_OP2_DIV:
+        case HLSL_OP2_LOGIC_OR:
         case HLSL_OP2_MAX:
         case HLSL_OP2_MIN:
         case HLSL_OP2_MUL: