diff --git a/asterix-app/src/test/resources/runtimets/queries/aggregate/query-issue400/query-issue400.1.ddl.aql b/asterix-app/src/test/resources/runtimets/queries/aggregate/query-issue400/query-issue400.1.ddl.aql
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/queries/aggregate/query-issue400/query-issue400.1.ddl.aql
diff --git a/asterix-app/src/test/resources/runtimets/queries/aggregate/query-issue400/query-issue400.2.update.aql b/asterix-app/src/test/resources/runtimets/queries/aggregate/query-issue400/query-issue400.2.update.aql
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/queries/aggregate/query-issue400/query-issue400.2.update.aql
diff --git a/asterix-app/src/test/resources/runtimets/queries/aggregate/query-issue400/query-issue400.3.query.aql b/asterix-app/src/test/resources/runtimets/queries/aggregate/query-issue400/query-issue400.3.query.aql
new file mode 100644
index 0000000..116cb43
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/queries/aggregate/query-issue400/query-issue400.3.query.aql
@@ -0,0 +1,2 @@
+let $l := [[1,2,3,4,5],[6,7,8,9]]
+return count(for $i in $l return $i)
\ No newline at end of file
diff --git a/asterix-app/src/test/resources/runtimets/results/aggregate/query-issue400/query-issue400.1.adm b/asterix-app/src/test/resources/runtimets/results/aggregate/query-issue400/query-issue400.1.adm
new file mode 100644
index 0000000..d8263ee
--- /dev/null
+++ b/asterix-app/src/test/resources/runtimets/results/aggregate/query-issue400/query-issue400.1.adm
@@ -0,0 +1 @@
+2
\ No newline at end of file
diff --git a/asterix-app/src/test/resources/runtimets/testsuite.xml b/asterix-app/src/test/resources/runtimets/testsuite.xml
index 6cb0ecc..7b3129d 100644
--- a/asterix-app/src/test/resources/runtimets/testsuite.xml
+++ b/asterix-app/src/test/resources/runtimets/testsuite.xml
@@ -1,6 +1,11 @@
 <test-suite xmlns="urn:xml.testframework.asterix.ics.uci.edu" ResultOffsetPath="results" QueryOffsetPath="queries" QueryFileExtension=".aql">
   <test-group name="aggregate">
     <test-case FilePath="aggregate">
+      <compilation-unit name="query-issue400">
+        <output-dir compare="Text">query-issue400</output-dir>
+      </compilation-unit>
+    </test-case>
+    <test-case FilePath="aggregate">
       <compilation-unit name="issue395">
         <output-dir compare="Text">issue395</output-dir>
       </compilation-unit>
diff --git a/asterix-om/src/main/java/edu/uci/ics/asterix/om/functions/AsterixBuiltinFunctions.java b/asterix-om/src/main/java/edu/uci/ics/asterix/om/functions/AsterixBuiltinFunctions.java
index 2be7fbd1..bea62dc 100644
--- a/asterix-om/src/main/java/edu/uci/ics/asterix/om/functions/AsterixBuiltinFunctions.java
+++ b/asterix-om/src/main/java/edu/uci/ics/asterix/om/functions/AsterixBuiltinFunctions.java
@@ -704,7 +704,7 @@
         add(RECTANGLE_CONSTRUCTOR, OptionalARectangleTypeComputer.INSTANCE);
         // add(RECORD_TYPE_CONSTRUCTOR, null);
         add(SCALAR_AVG, ScalarVersionOfAggregateResultType.INSTANCE);
-        add(SCALAR_COUNT, ScalarVersionOfAggregateResultType.INSTANCE);
+        add(SCALAR_COUNT, AInt32TypeComputer.INSTANCE);
         add(SCALAR_GLOBAL_AVG, ScalarVersionOfAggregateResultType.INSTANCE);
         add(SCALAR_LOCAL_AVG, ScalarVersionOfAggregateResultType.INSTANCE);
         add(SCALAR_MAX, ScalarVersionOfAggregateResultType.INSTANCE);