diff --git a/sicvar.c b/sicvar.c
index 7d2ffc33..be6d8e07 100644
--- a/sicvar.c
+++ b/sicvar.c
@@ -240,7 +240,7 @@ int VarSetFloat(pSicsVariable self, float fNew, int iUserRights)
 
   if (self->iAccessCode < iUserRights) {
     return 0;
-  } else {
+  } else if (self->fVal != fNew) {
     self->fVal = fNew;
     InvokeCallBack(self->pCall, VALUECHANGE, self);
     tracePar(self->name,"%f",fNew);
@@ -256,7 +256,7 @@ int VarSetInt(pSicsVariable self, int iNew, int iUserRights)
 
   if (self->iAccessCode < iUserRights) {
     return 0;
-  } else {
+  } else if (self->iVal != iNew) {
     self->iVal = iNew;
     InvokeCallBack(self->pCall, VALUECHANGE, self);
     tracePar(self->name,"%d",iNew);
@@ -272,7 +272,7 @@ int VarSetText(pSicsVariable self, char *pNew, int iUserRights)
 
   if (self->iAccessCode < iUserRights) {
     return 0;
-  } else {
+  } else if (self->text && strcmp(self->text, pNew)) {
     if (self->text) {
       free(self->text);
     }