diff --git a/src/include/final/fspinbox.h b/src/include/final/fspinbox.h
index 694b7fdf..1395838c 100644
--- a/src/include/final/fspinbox.h
+++ b/src/include/final/fspinbox.h
@@ -164,11 +164,11 @@ inline sInt64 FSpinBox::getValue()
 { return value; }
 
 //----------------------------------------------------------------------
-FString FSpinBox::getPrefix() const
+inline FString FSpinBox::getPrefix() const
 { return pfix; }
 
 //----------------------------------------------------------------------
-FString FSpinBox::getSuffix() const
+inline FString FSpinBox::getSuffix() const
 { return sfix; }
 
 //----------------------------------------------------------------------