diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourceAllocation.java b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourceAllocation.java
index 1bf108c8a..4942665cc 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourceAllocation.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourceAllocation.java
@@ -771,7 +771,8 @@ public abstract class ResourceAllocation<T extends DayAssignment> extends
             private AllocateResourcesPerDayOnInterval(
                     IntraDayDate startInclusive, IntraDayDate endExclusive) {
                 this.startInclusive = startInclusive;
-                this.endExclusive = endExclusive;
+                this.endExclusive = IntraDayDate.max(startInclusive,
+                        endExclusive);
             }
 
             @Override
diff --git a/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/GenericResourceAllocationTest.java b/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/GenericResourceAllocationTest.java
index f03aaef87..1c207b773 100644
--- a/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/GenericResourceAllocationTest.java
+++ b/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/GenericResourceAllocationTest.java
@@ -456,8 +456,8 @@ public class GenericResourceAllocationTest {
         assertThat(orderedAssignmentsFor, haveHours(hoursPerDay, hoursPerDay));
     }
 
-    @Test(expected = IllegalArgumentException.class)
-    public void whenAllocatingUntilSomeEndDateTheEndDateMustNotBeBeforeTaskStart() {
+    @Test
+    public void whenAllocatingUntilSomeEndDateBeforeTheStartNothingIsDone() {
         LocalDate start = new LocalDate(2006, 10, 5);
         givenTaskWithStartAndEnd(toInterval(start, Period.days(4)));
         givenGenericResourceAllocationForTask(task);
@@ -467,6 +467,9 @@ public class GenericResourceAllocationTest {
         genericResourceAllocation.forResources(Arrays.asList(worker1))
                 .resourcesPerDayUntil(start.minusDays(1))
                 .allocate(resourcesPerDay);
+
+        assertTrue(genericResourceAllocation.getOrderedAssignmentsFor(worker1)
+                .isEmpty());
     }
 
     @Test(expected = IllegalArgumentException.class)