diff --git a/src/classes/PFourier.cpp b/src/classes/PFourier.cpp
index 7c6808f4..2178f97f 100644
--- a/src/classes/PFourier.cpp
+++ b/src/classes/PFourier.cpp
@@ -382,9 +382,10 @@ PFourier::PFourier(TH1F *data, Int_t unitTag, Double_t startTime, Double_t endTi
       fValid = false;
       return;
     }
-#endif
+#else
     fValid = false;
     return;
+#endif
   }
 
   if (fUseFFTW) {
@@ -420,8 +421,9 @@ PFourier::PFourier(TH1F *data, Int_t unitTag, Double_t startTime, Double_t endTi
     }
     if ((fReal_ptr==0) || (fComp_ptr==0))
       fValid = false;
-#endif
+#else
     fValid = false;
+#endif
   }
 }
 
@@ -482,9 +484,10 @@ void PFourier::Transform(UInt_t apodizationTag)
     status = fDks.callR2CFFT(fReal_ptr, fComp_ptr, 1, dimsize);
     // read data from accelerator
     status = fDks.readData< complex<double> >(fComp_ptr, fOutDKS, size);
-#endif
+#else
     fValid = false;
     return;
+#endif
   }
 
   // correct the phase for tstart != 0.0