diff --git a/RTCP/Cobalt/OutputProc/src/TBB_Dipole.cc b/RTCP/Cobalt/OutputProc/src/TBB_Dipole.cc
index 3ee4dfcc9bddd9fa1bb5ddf332cf1cb2ee000c0b..657b0ae8cc0a5be315e7e77f8cc02ba1af6d6410 100644
--- a/RTCP/Cobalt/OutputProc/src/TBB_Dipole.cc
+++ b/RTCP/Cobalt/OutputProc/src/TBB_Dipole.cc
@@ -397,7 +397,7 @@ namespace LOFAR
                 currentSubBand.centralFrequency;
             currentSubBand.dataSet->centralFrequencyUnit().value = "Hz";
             currentSubBand.dataSet->timeResolution().value =
-                SPECTRAL_TRANSFORM_SIZE /
+                static_cast< double >(SPECTRAL_TRANSFORM_SIZE) /
                     (frame.header.sampleFreq * 1000000.0);
             currentSubBand.dataSet->timeResolutionUnit().value =
                 "s";