diff --git a/rtl/eclrtl/eclhelper_base.cpp b/rtl/eclrtl/eclhelper_base.cpp
index fac7194d86b..238840a21b9 100644
--- a/rtl/eclrtl/eclhelper_base.cpp
+++ b/rtl/eclrtl/eclhelper_base.cpp
@@ -620,6 +620,7 @@ const char * CThorSoapActionArg::getXpathHintsXml() { return nullptr;}
 const char * CThorSoapActionArg::getRequestHeader() { return nullptr; }
 const char * CThorSoapActionArg::getRequestFooter() { return nullptr; }
 unsigned CThorSoapActionArg::getPersistMaxRequests() { return 0; }
+unsigned CThorSoapActionArg::getPersistPoolSize() { return 0; }
 
 //CThorSoapCallArg
 
@@ -646,6 +647,7 @@ const char * CThorSoapCallArg::getXpathHintsXml() { return nullptr; }
 const char * CThorSoapCallArg::getRequestHeader() { return nullptr; }
 const char * CThorSoapCallArg::getRequestFooter() { return nullptr; }
 unsigned CThorSoapCallArg::getPersistMaxRequests() { return 0; }
+unsigned CThorSoapCallArg::getPersistPoolSize() { return 0; }
 
 size32_t CThorSoapCallArg::onFailTransform(ARowBuilder & rowBuilder, const void * left, IException * e) { return 0; }
 void CThorSoapCallArg::getLogText(size32_t & lenText, char * & text, const void * left) { lenText =0; text = NULL; }
diff --git a/rtl/include/eclhelper_base.hpp b/rtl/include/eclhelper_base.hpp
index 0a0ef1c5e08..07dc23f8d4f 100644
--- a/rtl/include/eclhelper_base.hpp
+++ b/rtl/include/eclhelper_base.hpp
@@ -823,6 +823,7 @@ class ECLRTL_API CThorSoapActionArg : public CThorSinkArgOf<IHThorSoapActionArg>
     virtual const char * getRequestHeader() override;
     virtual const char * getRequestFooter() override;
     virtual unsigned getPersistMaxRequests() override;
+    unsigned getPersistPoolSize(); // Included for backward compatibility to prevent linking problems
 };
 
 class ECLRTL_API CThorSoapCallArg : public CThorArgOf<IHThorSoapCallArg>
@@ -854,6 +855,7 @@ class ECLRTL_API CThorSoapCallArg : public CThorArgOf<IHThorSoapCallArg>
     virtual const char * getRequestHeader() override;
     virtual const char * getRequestFooter() override;
     virtual unsigned getPersistMaxRequests() override;
+    unsigned getPersistPoolSize(); // Included for backward compatibility to prevent linking problems
 };
 
 typedef CThorSoapCallArg CThorHttpCallArg;