diff --git a/api/src/org/labkey/api/qc/TsvDataSerializer.java b/api/src/org/labkey/api/qc/TsvDataSerializer.java
index cf73bcccae7..391d3aaa376 100644
--- a/api/src/org/labkey/api/qc/TsvDataSerializer.java
+++ b/api/src/org/labkey/api/qc/TsvDataSerializer.java
@@ -150,6 +150,7 @@ protected DataIteratorBuilder _importRunData(ExpProtocol protocol, File runData,
         Domain dataDomain = provider.getResultsDomain(protocol);
         DataLoaderSettings loaderSettings = new DataLoaderSettings();
         loaderSettings.setAllowUnexpectedColumns(true);
+        loaderSettings.setBestEffortConversion(true); // GitHub Issue 751: setBestEffortConversion to match TsvDataExchangeHandler._writeRunData
 
         return context -> {
             FileLike fo = new FileSystemLike.Builder(runData.toURI()).readonly().root();