diff --git a/asterix-common/src/main/java/edu/uci/ics/asterix/common/context/PrefixMergePolicy.java b/asterix-common/src/main/java/edu/uci/ics/asterix/common/context/PrefixMergePolicy.java
index d975c2a..059572b 100644
--- a/asterix-common/src/main/java/edu/uci/ics/asterix/common/context/PrefixMergePolicy.java
+++ b/asterix-common/src/main/java/edu/uci/ics/asterix/common/context/PrefixMergePolicy.java
@@ -57,6 +57,7 @@
                 long componentSize = ((AbstractDiskLSMComponent) c).getComponentSize();
                 if (componentSize > maxMergableComponentSize) {
                     startIndex = i;
+                    totalSize = 0;
                     continue;
                 }
                 totalSize += componentSize;