diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourcesPerDay.java b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourcesPerDay.java
index bc90912ab..8642d046c 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourcesPerDay.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourcesPerDay.java
@@ -101,8 +101,14 @@ public class ResourcesPerDay {
 
     public int asHoursGivenResourceWorkingDayOf(
             Integer resourceWorkingDayHours) {
-        return getAmount().multiply(new BigDecimal(resourceWorkingDayHours))
-                .setScale(0, RoundingMode.HALF_UP).intValue();
+        BigDecimal multiply = getAmount().multiply(
+                new BigDecimal(resourceWorkingDayHours));
+        if(multiply.compareTo(BigDecimal.ZERO)>0){
+            return Math.max(1, multiply.setScale(0, RoundingMode.HALF_UP)
+                    .intValue());
+        } else {
+            return 0;
+        }
     }
 
     @Override
diff --git a/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/ResourcesPerDayTest.java b/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/ResourcesPerDayTest.java
index 9c0987c39..f9de3fbc3 100644
--- a/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/ResourcesPerDayTest.java
+++ b/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/ResourcesPerDayTest.java
@@ -128,6 +128,21 @@ public class ResourcesPerDayTest {
         assertEquals(a, b);
     }
 
+    @Test
+    public void asHoursMustReturnOneIfAmountIsGreaterThanZero() {
+        ResourcesPerDay amount = ResourcesPerDay.amount(new BigDecimal(0.05));
+        int hours = amount
+                .asHoursGivenResourceWorkingDayOf(8);
+        assertThat(hours, equalTo(1));
+    }
+
+    @Test
+    public void ifTheAmountIsZeroMustReturnZero() {
+        ResourcesPerDay amount = ResourcesPerDay.amount(BigDecimal.ZERO);
+        int hours = amount.asHoursGivenResourceWorkingDayOf(8);
+        assertThat(hours, equalTo(0));
+    }
+
     @Test
     public void isZeroIfHaveZeroValue() {
         BigDecimal[] examples = { new BigDecimal(0.0001), new BigDecimal(0),