diff --git a/build/org.eclipse.cdt.managedbuilder.core.tests/plugin.xml b/build/org.eclipse.cdt.managedbuilder.core.tests/plugin.xml
index 2b33c5bac39..d06a3d86224 100644
--- a/build/org.eclipse.cdt.managedbuilder.core.tests/plugin.xml
+++ b/build/org.eclipse.cdt.managedbuilder.core.tests/plugin.xml
@@ -282,6 +282,14 @@
                      builtIn="false">
                </listOptionValue>
             </option>
+            <option
+                  valueType="stringList"
+                  name="No Command StringList"
+                  id="sub.tool.string.list">
+               <listOptionValue value="x"/>
+               <listOptionValue value="y"/>
+               <listOptionValue value="z"/>
+            </option>
          </tool>
       </target>
       <target
diff --git a/build/org.eclipse.cdt.managedbuilder.core.tests/tests/org/eclipse/cdt/managedbuild/core/tests/ManagedBuildCoreTests.java b/build/org.eclipse.cdt.managedbuilder.core.tests/tests/org/eclipse/cdt/managedbuild/core/tests/ManagedBuildCoreTests.java
index 0e81ec2c223..9772909426a 100644
--- a/build/org.eclipse.cdt.managedbuilder.core.tests/tests/org/eclipse/cdt/managedbuild/core/tests/ManagedBuildCoreTests.java
+++ b/build/org.eclipse.cdt.managedbuilder.core.tests/tests/org/eclipse/cdt/managedbuild/core/tests/ManagedBuildCoreTests.java
@@ -1232,6 +1232,8 @@ public class ManagedBuildCoreTests extends TestCase {
 	 * in the sub target, the test does a sanity check just to be complete.
 	 */
 	private void checkSubTarget(ITarget target) throws BuildException {
+		final String expectedFlags = "-I/usr/include -I/opt/gnome/include -IC:\\home\\tester/include -I\"../includes\" x y z";
+		
 		// Check the overridden clean command
 		assertEquals("rm -yourworld", target.getCleanCommand());
 		// Make sure the target inherits the make command
@@ -1259,7 +1261,7 @@ public class ManagedBuildCoreTests extends TestCase {
 		assertEquals("Sub Tool", subTool.getName());
 		// Confirm that it has four options
 		IOption[] subOpts = subTool.getOptions();
-		assertEquals(4, subOpts.length);
+		assertEquals(5, subOpts.length);
 		assertEquals("", subTool.getOutputFlag());
 		assertTrue(subTool.buildsFileType("yarf"));
 		assertTrue(subTool.producesFileType("bus"));
@@ -1311,6 +1313,14 @@ public class ManagedBuildCoreTests extends TestCase {
 		assertEquals("obj1.o", objs[0]);
 		assertEquals("obj2.o", objs[1]);
 		assertEquals(IOption.BROWSE_FILE, subOpts[3].getBrowseType());
+		assertNull(subOpts[3].getCommand());
+		
+		// There should be a string list with no command
+		assertEquals("No Command StringList", subOpts[4].getName());
+		assertEquals(IOption.STRING_LIST, subOpts[4].getValueType());
+		
+		// Make sure the tool flags look right
+		assertEquals(subTool.getToolFlags(), expectedFlags);
 		
 		// Get the configs for this target; it should inherit all the configs defined for the parent
 		IConfiguration[] configs = target.getConfigurations();
diff --git a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/Tool.java b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/Tool.java
index 56046f6519a..313f5df2ac4 100644
--- a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/Tool.java
+++ b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/Tool.java
@@ -275,7 +275,8 @@ public class Tool extends BuildObject implements ITool, IOptionCategory {
 					String[] list = option.getStringListValue();
 					for (int j = 0; j < list.length; j++) {
 						String temp = list[j];
-						buf.append(listCmd + temp + WHITE_SPACE);
+						if (listCmd != null) buf.append(listCmd);
+						buf.append(temp + WHITE_SPACE);
 					}
 					break;
 					
diff --git a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/ToolReference.java b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/ToolReference.java
index 6bd4bcaddf0..a551ffb7ae6 100644
--- a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/ToolReference.java
+++ b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/core/ToolReference.java
@@ -461,7 +461,8 @@ public class ToolReference implements IToolReference {
 					String[] list = option.getStringListValue();
 					for (int j = 0; j < list.length; j++) {
 						String temp = list[j];
-						buf.append(cmd + temp + WHITE_SPACE);
+						if (cmd != null) buf.append(cmd);
+						buf.append(temp + WHITE_SPACE);
 					}
 					break;