diff --git a/source/dub/generators/generator.d b/source/dub/generators/generator.d
index 21548ba..49e9f5a 100644
--- a/source/dub/generators/generator.d
+++ b/source/dub/generators/generator.d
@@ -99,6 +99,7 @@
 		string[] mainfiles;
 		collect(settings, m_project.rootPackage, targets, configs, mainfiles, null);
 		downwardsInheritSettings(m_project.rootPackage.name, targets, targets[m_project.rootPackage.name].buildSettings);
+		addBuildTypeSettings(targets, settings);
 		foreach (ref t; targets.byValue) enforceBuildRequirements(t.buildSettings);
 		auto bs = &targets[m_project.rootPackage.name].buildSettings;
 		if (bs.targetType == TargetType.executable) bs.addSourceFiles(mainfiles);
@@ -214,19 +215,7 @@
 			} else pt.packages ~= dep;
 		}
 
-		if (is_target) {
-			BuildSettings targetbs = buildsettings.dup;
-			targetbs.add(settings.buildSettings);
-
-			// add build type settings and convert plain DFLAGS to build options
-			m_project.addBuildTypeSettings(targetbs, settings.platform, settings.buildType, pack is m_project.rootPackage);
-			settings.compiler.extractBuildOptions(targetbs);
-
-			enforce (generates_binary || pack !is m_project.rootPackage || (targetbs.options & BuildOption.syntaxOnly),
-				format("Main package must have a binary target type, not %s. Cannot build.", tt));
-
-			targets[pack.name].buildSettings = targetbs;
-		}
+		if (is_target) targets[pack.name].buildSettings = buildsettings.dup;
 
 		return buildsettings;
 	}
@@ -267,6 +256,22 @@
 
 		return packs;
 	}
+
+	private void addBuildTypeSettings(TargetInfo[string] targets, GeneratorSettings settings)
+	{
+		foreach (ref t; targets) {
+			t.buildSettings.add(settings.buildSettings);
+
+			// add build type settings and convert plain DFLAGS to build options
+			m_project.addBuildTypeSettings(t.buildSettings, settings.platform, settings.buildType, t.pack is m_project.rootPackage);
+			settings.compiler.extractBuildOptions(t.buildSettings);
+
+			auto tt = t.buildSettings.targetType;
+			bool generates_binary = tt != TargetType.sourceLibrary && tt != TargetType.none;
+			enforce (generates_binary || t.pack !is m_project.rootPackage || (t.buildSettings.options & BuildOption.syntaxOnly),
+				format("Main package must have a binary target type, not %s. Cannot build.", tt));
+		}
+	}
 }
 
 
diff --git a/test/issue686-multiple-march.sh b/test/issue686-multiple-march.sh
new file mode 100755
index 0000000..cdf2cde
--- /dev/null
+++ b/test/issue686-multiple-march.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -e
+
+cd ${CURR_DIR}/issue686-multiple-march
+
+${DUB} build --bare --force --compiler=${DC} -a x86_64 -v main 2>&1 | grep -e "-m64 -m64" -c && exit 1 || exit 0
diff --git a/test/issue686-multiple-march/.no_build b/test/issue686-multiple-march/.no_build
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/issue686-multiple-march/.no_build
diff --git a/test/issue686-multiple-march/.no_run b/test/issue686-multiple-march/.no_run
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/issue686-multiple-march/.no_run
diff --git a/test/issue686-multiple-march/.no_test b/test/issue686-multiple-march/.no_test
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/issue686-multiple-march/.no_test
diff --git a/test/issue686-multiple-march/a/dub.json b/test/issue686-multiple-march/a/dub.json
new file mode 100644
index 0000000..341d126
--- /dev/null
+++ b/test/issue686-multiple-march/a/dub.json
@@ -0,0 +1,6 @@
+{
+	"name": "a",
+	"dependencies": {
+		"b": {"path": "../b"}
+	}
+}
\ No newline at end of file
diff --git a/test/issue686-multiple-march/a/source/a.d b/test/issue686-multiple-march/a/source/a.d
new file mode 100644
index 0000000..1581659
--- /dev/null
+++ b/test/issue686-multiple-march/a/source/a.d
@@ -0,0 +1,5 @@
+module a;
+
+void afun()
+{
+}
diff --git a/test/issue686-multiple-march/b/dub.json b/test/issue686-multiple-march/b/dub.json
new file mode 100644
index 0000000..2824d72
--- /dev/null
+++ b/test/issue686-multiple-march/b/dub.json
@@ -0,0 +1,3 @@
+{
+	"name": "b"
+}
\ No newline at end of file
diff --git a/test/issue686-multiple-march/b/source/b.d b/test/issue686-multiple-march/b/source/b.d
new file mode 100644
index 0000000..003a74e
--- /dev/null
+++ b/test/issue686-multiple-march/b/source/b.d
@@ -0,0 +1,5 @@
+module b;
+
+void bfun()
+{
+}
diff --git a/test/issue686-multiple-march/main/dub.json b/test/issue686-multiple-march/main/dub.json
new file mode 100644
index 0000000..0160e79
--- /dev/null
+++ b/test/issue686-multiple-march/main/dub.json
@@ -0,0 +1,7 @@
+{
+	"name": "main",
+	"dependencies": {
+		"a": {"path": "../a"},
+		"b": {"path": "../b"}
+	}
+}
\ No newline at end of file
diff --git a/test/issue686-multiple-march/main/source/main.d b/test/issue686-multiple-march/main/source/main.d
new file mode 100644
index 0000000..fba3ebb
--- /dev/null
+++ b/test/issue686-multiple-march/main/source/main.d
@@ -0,0 +1,8 @@
+import a;
+import b;
+
+void main()
+{
+	afun();
+	bfun();
+}
\ No newline at end of file