diff --git a/springloaded/src/main/java/org/springsource/loaded/Utils.java b/springloaded/src/main/java/org/springsource/loaded/Utils.java
index ca92e59..30c3bf3 100644
--- a/springloaded/src/main/java/org/springsource/loaded/Utils.java
+++ b/springloaded/src/main/java/org/springsource/loaded/Utils.java
@@ -1016,7 +1016,7 @@ public class Utils implements Opcodes, Constants {
 		public boolean isDoubleSlot() {
 			if (kind == Kind.PRIMITIVE) {
 				char ch = descriptor.charAt(0);
-				return ch == 'J' || ch == 'L';
+				return ch == 'J' || ch == 'D';
 			}
 			return false;
 		}
diff --git a/springloaded/src/test/java/org/springsource/loaded/test/ReloadableTypeTests.java b/springloaded/src/test/java/org/springsource/loaded/test/ReloadableTypeTests.java
index 4ad2538..7422ff2 100644
--- a/springloaded/src/test/java/org/springsource/loaded/test/ReloadableTypeTests.java
+++ b/springloaded/src/test/java/org/springsource/loaded/test/ReloadableTypeTests.java
@@ -564,6 +564,13 @@ public class ReloadableTypeTests extends SpringLoadedTests {
 		assertFalse(rt.isDoubleSlot());
 		assertFalse(rt.isVoid());
 
+		rt = ReturnType.getReturnType("D");
+		assertEquals(ReturnType.Kind.PRIMITIVE, rt.kind);
+		assertEquals("D", rt.descriptor);
+		assertTrue(rt.isPrimitive());
+		assertTrue(rt.isDoubleSlot());
+		assertFalse(rt.isVoid());
+
 		rt = ReturnType.getReturnType("[Ljava/lang/String;");
 		assertEquals(ReturnType.Kind.ARRAY, rt.kind);
 		assertEquals("[Ljava/lang/String;", rt.descriptor);