diff --git a/src/Sage.Engine.Data/Sqlite/ParameterizedQueryItem.cs b/src/Sage.Engine.Data/Sqlite/ParameterizedQueryItem.cs
index c6382f5..e656ef3 100644
--- a/src/Sage.Engine.Data/Sqlite/ParameterizedQueryItem.cs
+++ b/src/Sage.Engine.Data/Sqlite/ParameterizedQueryItem.cs
@@ -46,7 +46,7 @@ public bool CaseSensitive
         public ParameterizedQueryItem(string parameterName, string data, bool caseSensitive)
         {
             QuotedIdentifier = QuotedIdentifier.Create(parameterName);
-            ParameterizedName = $"${QuotedIdentifier.Unquote()}";
+            ParameterizedName = $"${QuotedIdentifier.Unquote().Replace(' ', '_')}";
             CaseSensitive = caseSensitive;
             Data = data;
         }
diff --git a/src/Sage.Engine.Tests/DataExtensions/LOYALTY.csv b/src/Sage.Engine.Tests/DataExtensions/LOYALTY.csv
index e792c98..eaaa132 100644
--- a/src/Sage.Engine.Tests/DataExtensions/LOYALTY.csv
+++ b/src/Sage.Engine.Tests/DataExtensions/LOYALTY.csv
@@ -1,4 +1,4 @@
-EmailAddress,SubscriberKey,FirstName,LastName,LoyaltyLevel
+EmailAddress,SubscriberKey,First Name,LastName,LoyaltyLevel
 donnie@northerntrailoutfitters.com,1,Donnie,Stanton,Silver
 wilburn@northerntrailoutfitters.com,2,Wilburn,McMillan,Gold
 aubrey@northerntrailoutfitters.com,3,Aubrey,Kirby,Gold
diff --git a/src/Sage.Engine.Tests/Functions/DataTests.cs b/src/Sage.Engine.Tests/Functions/DataTests.cs
index 6d5f6e5..4f44a9b 100644
--- a/src/Sage.Engine.Tests/Functions/DataTests.cs
+++ b/src/Sage.Engine.Tests/Functions/DataTests.cs
@@ -10,7 +10,14 @@ internal class DataTests : FunctionTestBase
         [Test]
         public void Lookup()
         {
-            var emailAddress = this._runtimeContext.LOOKUP("Loyalty","EmailAddress","SubscriberKey", "1");
+            var emailAddress = this._runtimeContext.LOOKUP("Loyalty", "EmailAddress", "SubscriberKey", "1");
+            Assert.That(emailAddress, Is.EqualTo("donnie@northerntrailoutfitters.com"));
+        }
+
+        [Test]
+        public void LookupWithSpaceHeader()
+        {
+            var emailAddress = this._runtimeContext.LOOKUP("Loyalty", "EmailAddress", "First Name", "donnie");
             Assert.That(emailAddress, Is.EqualTo("donnie@northerntrailoutfitters.com"));
         }
     }