gistfile1.txt

diff --git a/core/src/main/java/org/apache/whirr/ClusterSpec.java b/core/src/main/java/org/apache/whirr/ClusterSpec.java
index 594220e..e652646 100644
--- a/core/src/main/java/org/apache/whirr/ClusterSpec.java
+++ b/core/src/main/java/org/apache/whirr/ClusterSpec.java
@@ -355,7 +355,7 @@ public class ClusterSpec {
     setStateStoreContainer(getString(Property.STATE_STORE_CONTAINER));
     setStateStoreBlob(getString(Property.STATE_STORE_BLOB));
 
-    setAwsEc2SpotPrice(getFloat(Property.AWS_EC2_SPOT_PRICE, -1));
+    setAwsEc2SpotPrice(getFloat(Property.AWS_EC2_SPOT_PRICE, null));
 
     checkAndSetKeyPair();
     
@@ -481,7 +481,7 @@ public class ClusterSpec {
     return config.getInt(key.getConfigName(), defaultValue);
   }
 
-  private float getFloat(Property key, float defaultValue) {
+  private Float getFloat(Property key, Float defaultValue) {
     return config.getFloat(key.getConfigName(), defaultValue);
   }