diff --git a/src/finiteVolume/cfdTools/general/fieldSources/basicSource/basicSource/IObasicSourceList.C b/src/finiteVolume/cfdTools/general/fieldSources/basicSource/basicSource/IObasicSourceList.C
index 8ce372e8ff..864ed53770 100644
--- a/src/finiteVolume/cfdTools/general/fieldSources/basicSource/basicSource/IObasicSourceList.C
+++ b/src/finiteVolume/cfdTools/general/fieldSources/basicSource/basicSource/IObasicSourceList.C
@@ -39,7 +39,7 @@ Foam::IObasicSourceList::IObasicSourceList
             "sourcesProperties",
             mesh.time().constant(),
             mesh,
-            IOobject::MUST_READ,
+            IOobject::MUST_READ_IF_MODIFIED,
             IOobject::NO_WRITE
         )
     ),