diff --git a/trick_source/codegen/Interface_Code_Gen/FieldDescription.cpp b/trick_source/codegen/Interface_Code_Gen/FieldDescription.cpp
index fa8d76a0..a4d613d8 100644
--- a/trick_source/codegen/Interface_Code_Gen/FieldDescription.cpp
+++ b/trick_source/codegen/Interface_Code_Gen/FieldDescription.cpp
@@ -443,6 +443,14 @@ void FieldDescription::setBitFieldWidth(unsigned int len) {
     bitfield_width = len ;
 }
 
+void FieldDescription::setBitFieldStart(unsigned int sb) {
+    bitfield_start_bit = sb ;
+}
+
+void FieldDescription::setBitFieldByteOffset(unsigned int wo) {
+    bitfield_word_offset = wo ;
+}
+
 unsigned int FieldDescription::getBitFieldWidth() {
     return bitfield_width ;
 }
diff --git a/trick_source/codegen/Interface_Code_Gen/FieldDescription.hh b/trick_source/codegen/Interface_Code_Gen/FieldDescription.hh
index 0f2a68ef..8c59f763 100644
--- a/trick_source/codegen/Interface_Code_Gen/FieldDescription.hh
+++ b/trick_source/codegen/Interface_Code_Gen/FieldDescription.hh
@@ -62,6 +62,8 @@ class FieldDescription : public ConstructValues {
         std::string getEnumString() ;
         void setBitField( bool yes_no ) ;
         void setBitFieldWidth( unsigned int len ) ;
+        void setBitFieldStart( unsigned int len ) ;
+        void setBitFieldByteOffset( unsigned int len ) ;
         unsigned int getBitFieldWidth() ;
         unsigned int getBitFieldStart() ;
         unsigned int getBitFieldByteOffset() ;
diff --git a/trick_source/codegen/Interface_Code_Gen/FieldVisitor.cpp b/trick_source/codegen/Interface_Code_Gen/FieldVisitor.cpp
index f6e29c75..aaf3002a 100644
--- a/trick_source/codegen/Interface_Code_Gen/FieldVisitor.cpp
+++ b/trick_source/codegen/Interface_Code_Gen/FieldVisitor.cpp
@@ -215,6 +215,9 @@ bool FieldVisitor::VisitFieldDecl( clang::FieldDecl *field ) {
     if ( field->isBitField()) {
         fdes->setBitField(true) ;
         fdes->setBitFieldWidth(field->getBitWidthValue(field->getASTContext())) ;
+        unsigned int field_offset_bits = field->getASTContext().getFieldOffset(field) + fdes->getBaseClassOffset() * 8 ;
+        fdes->setBitFieldStart( 32 - (field_offset_bits % 32) - fdes->getBitFieldWidth()) ;
+        fdes->setBitFieldByteOffset((field_offset_bits / 32) * 4 ) ;
     }
 
     if ( debug_level >= 3 ) {