diff --git a/src/builder.ts b/src/builder.ts
index 14eef7f7cb3..d5397d28476 100644
--- a/src/builder.ts
+++ b/src/builder.ts
@@ -68,15 +68,15 @@ export function normalizeOptions(args: CliOptions): BuildOptions {
     }
 
     function commonArch(): Array<Arch> {
-      if (args.ia32) {
+      if (args.ia32 && args.x64) {
+        return [Arch.x64, Arch.ia32]
+      }
+      else if (args.ia32) {
         return [Arch.ia32]
       }
       else if (args.x64) {
         return [Arch.x64]
       }
-      else if (args.ia32 && args.x64) {
-        return [Arch.x64, Arch.ia32]
-      }
       else {
         return [archFromString(process.arch)]
       }
@@ -128,7 +128,12 @@ export function normalizeOptions(args: CliOptions): BuildOptions {
   }
 
   if (targets.size === 0) {
-    targets = createTargets(normalizePlatforms(args.platform), null, args.arch)
+    if (args.platform == null) {
+      processTargets(Platform.current(), [])
+    }
+    else {
+      targets = createTargets(normalizePlatforms(args.platform), null, args.arch)
+    }
   }
 
   const result = Object.assign({}, args)
@@ -158,7 +163,7 @@ export function createTargets(platforms: Array<Platform>, type?: string | null,
   const targets = new Map<Platform, Map<Arch, Array<string>>>()
   for (let platform of platforms) {
     const archs = platform === Platform.OSX ? [Arch.x64] : (arch === "all" ? [Arch.x64, Arch.ia32] : [archFromString(arch == null ? process.arch : arch)])
-    let archToType = new Map<Arch, Array<string>>()
+    const archToType = new Map<Arch, Array<string>>()
     targets.set(platform, archToType)
 
     for (let arch of archs) {
diff --git a/src/metadata.ts b/src/metadata.ts
index f530e944572..6d7afb12815 100755
--- a/src/metadata.ts
+++ b/src/metadata.ts
@@ -369,8 +369,16 @@ export class Platform {
     return this.name
   }
 
-  public createTarget(type?: string | null, arch: Arch = archFromString(process.arch)): Map<Platform, Map<Arch, Array<string>>> {
-    return new Map([[this, new Map([[arch, type == null ? [] : [type]]])]])
+  public createTarget(type?: string | null, ...archs: Array<Arch>): Map<Platform, Map<Arch, Array<string>>> {
+    const archToType = new Map()
+    for (let arch of (archs == null || archs.length === 0 ? [archFromString(process.arch)] : archs)) {
+      archToType.set(arch, type == null ? [] : [type])
+    }
+    return new Map([[this, archToType]])
+  }
+
+  public static current(): Platform {
+    return Platform.fromString(process.platform)
   }
 
   public static fromString(name: string): Platform {
diff --git a/test/src/BuildTest.ts b/test/src/BuildTest.ts
index 4c62df34268..70d40db3a92 100755
--- a/test/src/BuildTest.ts
+++ b/test/src/BuildTest.ts
@@ -27,6 +27,7 @@ test("cli", () => {
   }
 
   assertThat(parse("--osx")).isEqualTo(expected({targets: Platform.OSX.createTarget()}))
+  assertThat(parse("--ia32 --x64")).isEqualTo(expected({targets: Platform.current().createTarget(null, Arch.x64, Arch.ia32)}))
   assertThat(parse("--linux")).isEqualTo(expected({targets: Platform.LINUX.createTarget()}))
   assertThat(parse("--win")).isEqualTo(expected({targets: Platform.WINDOWS.createTarget()}))
   assertThat(parse("-owl")).isEqualTo(expected({targets: createTargets([Platform.OSX, Platform.WINDOWS, Platform.LINUX])}))
diff --git a/test/src/helpers/fileAssert.ts b/test/src/helpers/fileAssert.ts
index 893f7f2a895..697f3cd4e83 100644
--- a/test/src/helpers/fileAssert.ts
+++ b/test/src/helpers/fileAssert.ts
@@ -26,8 +26,12 @@ class Assertions {
 
   isEqualTo(expected: any) {
     if (!json8.equal(this.actual, expected)) {
+      const actualJson = JSON.stringify(this.actual, jsonReplacer, 2)
+      const expectedJson = JSON.stringify(expected, jsonReplacer, 2)
       throw new AssertionError({
-        message: prettyDiff(JSON.parse(JSON.stringify(this.actual, jsonReplacer)), JSON.parse(JSON.stringify(expected, jsonReplacer)))
+        message: `Expected \n${expectedJson}\n\nis not equal to\n\n${actualJson}\n\n${prettyDiff(JSON.parse(actualJson), JSON.parse(expectedJson))}`,
+        actual: this.actual,
+        expected: expected,
       })
     }
   }