diff --git a/src/LocalInstaller.ts b/src/LocalInstaller.ts
index b6d3bb9..916543a 100644
--- a/src/LocalInstaller.ts
+++ b/src/LocalInstaller.ts
@@ -24,6 +24,10 @@ export interface ListByPackage {
 }
 
 const TEN_MEGA_BYTE = 1024 * 1024 * 10;
+
+function quotify(value: string) {
+    return `"${value}"`;
+}
 export class LocalInstaller extends EventEmitter {
     private sourcesByTarget: ListByPackage;
     private options: Options;
@@ -81,7 +85,10 @@ export class LocalInstaller extends EventEmitter {
     }
 
     private installOne(target: InstallTarget): Promise<void> {
-        const toInstall = target.sources.map(source => resolvePackFile(this.uniqueDir, source.packageJson)).join(' ');
+        const toInstall = target.sources
+            .map(source => resolvePackFile(this.uniqueDir, source.packageJson))
+            .map(quotify)
+            .join(' ');
         const options: ExecOptions = {
             cwd: target.directory,
             maxBuffer: TEN_MEGA_BYTE
@@ -125,7 +132,7 @@ export class LocalInstaller extends EventEmitter {
     }
 
     private packOne(directory: string): Promise<void> {
-        return exec(`npm pack ${directory}`, { cwd: this.uniqueDir, maxBuffer: TEN_MEGA_BYTE })
+        return exec(`npm pack ${quotify(directory)}`, { cwd: this.uniqueDir, maxBuffer: TEN_MEGA_BYTE })
             .then(() => void this.emit('packed', directory));
     }
 
diff --git a/test/unit/LocalInstallerSpec.ts b/test/unit/LocalInstallerSpec.ts
index e1201cb..746ade8 100644
--- a/test/unit/LocalInstallerSpec.ts
+++ b/test/unit/LocalInstallerSpec.ts
@@ -50,9 +50,9 @@ describe('LocalInstaller install', () => {
 
         it('should pack correct packages', async () => {
             await sut.install();
-            expect(execStub).calledWith(`npm pack ${resolve('b')}`, { cwd: tmpDir, maxBuffer: TEN_MEGA_BYTE });
-            expect(execStub).calledWith(`npm pack ${resolve('c')}`, { cwd: tmpDir, maxBuffer: TEN_MEGA_BYTE });
-            expect(execStub).calledWith(`npm pack ${resolve('/e')}`, { cwd: tmpDir, maxBuffer: TEN_MEGA_BYTE });
+            expect(execStub).calledWith(`npm pack "${resolve('b')}"`, { cwd: tmpDir, maxBuffer: TEN_MEGA_BYTE });
+            expect(execStub).calledWith(`npm pack "${resolve('c')}"`, { cwd: tmpDir, maxBuffer: TEN_MEGA_BYTE });
+            expect(execStub).calledWith(`npm pack "${resolve('/e')}"`, { cwd: tmpDir, maxBuffer: TEN_MEGA_BYTE });
         });
 
         it('should install correct packages', async () => {
@@ -157,7 +157,7 @@ describe('LocalInstaller install', () => {
         });
     });
 
-    const tmp = (file: string) => resolve(tmpDir, file);
+    const tmp = (file: string) => `"${resolve(tmpDir, file)}"`;
 
     const stubPackageJson = (recipe: { [directory: string]: string }) => {
         Object.keys(recipe).forEach((directory, i) => {