diff --git a/bake/hcl_test.go b/bake/hcl_test.go
index 18d7a63ea5f0..745ac9b332e6 100644
--- a/bake/hcl_test.go
+++ b/bake/hcl_test.go
@@ -745,3 +745,50 @@ target "two" {
 	require.Equal(t, c.Targets[1].Name, "two")
 	require.Equal(t, map[string]string{"b": "pre-jkl"}, c.Targets[1].Args)
 }
+
+func TestCombineHCLAndJSONAttrs(t *testing.T) {
+	c, err := ParseFiles([]File{
+		{
+			Name: "docker-bake.hcl",
+			Data: []byte(`
+ABC = "foo"
+variable "DEF" {
+  default = ""
+}
+group "default" {
+  targets = ["one"]
+}
+target "one" {
+  args = {
+    a = "pre-${ABC}"
+  }
+}
+target "two" {
+  args = {
+    b = "pre-${DEF}"
+  }
+}`),
+		},
+		{
+			Name: "foo.json",
+			Data: []byte(`{"ABC": "oof", "variable": {"DEF": {"default": "bar"}}, "target": { "one": { "args": {"a": "pre-${ABC}-${DEF}"}} } }`),
+		},
+		{
+			Name: "bar.json",
+			Data: []byte(`{"ABC": "ghi", "DEF": "jkl"}`),
+		},
+	}, nil)
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(c.Groups))
+	require.Equal(t, "default", c.Groups[0].Name)
+	require.Equal(t, []string{"one"}, c.Groups[0].Targets)
+
+	require.Equal(t, 2, len(c.Targets))
+
+	require.Equal(t, c.Targets[0].Name, "one")
+	require.Equal(t, map[string]string{"a": "pre-ghi-jkl"}, c.Targets[0].Args)
+
+	require.Equal(t, c.Targets[1].Name, "two")
+	require.Equal(t, map[string]string{"b": "pre-jkl"}, c.Targets[1].Args)
+}
diff --git a/bake/hclparser/hclparser.go b/bake/hclparser/hclparser.go
index 233d6557d885..7b5dd351fe28 100644
--- a/bake/hclparser/hclparser.go
+++ b/bake/hclparser/hclparser.go
@@ -301,12 +301,6 @@ func Parse(b hcl.Body, opt Opt, val interface{}) hcl.Diagnostics {
 	}
 
 	attrs, diags := b.JustAttributes()
-	if diags.HasErrors() {
-		if d := removeAttributesDiags(diags, reserved, p.vars); len(d) > 0 {
-			return d
-		}
-	}
-
 	for _, v := range attrs {
 		if _, ok := reserved[v.Name]; ok {
 			continue
@@ -315,6 +309,12 @@ func Parse(b hcl.Body, opt Opt, val interface{}) hcl.Diagnostics {
 	}
 	delete(p.attrs, "function")
 
+	if diags.HasErrors() {
+		if d := removeAttributesDiags(diags, reserved, p.vars, p.attrs); len(d) > 0 {
+			return d
+		}
+	}
+
 	for k := range p.opt.Vars {
 		_ = p.resolveValue(k)
 	}
@@ -513,7 +513,7 @@ func setLabel(v reflect.Value, lbl string) int {
 	return -1
 }
 
-func removeAttributesDiags(diags hcl.Diagnostics, reserved map[string]struct{}, vars map[string]*variable) hcl.Diagnostics {
+func removeAttributesDiags(diags hcl.Diagnostics, reserved map[string]struct{}, vars map[string]*variable, attrs map[string]*hcl.Attribute) hcl.Diagnostics {
 	var fdiags hcl.Diagnostics
 	for _, d := range diags {
 		if fout := func(d *hcl.Diagnostic) bool {
@@ -535,6 +535,12 @@ func removeAttributesDiags(diags hcl.Diagnostics, reserved map[string]struct{},
 					return true
 				}
 			}
+			for a := range attrs {
+				// Do the same for global attributes
+				if strings.HasPrefix(d.Detail, fmt.Sprintf(`Argument "%s" was already set at `, a)) {
+					return true
+				}
+			}
 			return false
 		}(d); !fout {
 			fdiags = append(fdiags, d)