Out of memory mystery

I'm running the 32-bit Windows version of ghc-7.8.3. Here are two runs: $ RunMu +RTS -A64M -h -Sstat.log -i1 -RTS -c Strat.App.Abacus.Main Compiling afresh Strat.App.Abacus.Main Compiled afresh Strat.App.Abacus.Main, 1302.84s $ RunMu +RTS -A64M -Sstat.log -i1 -RTS -c Strat.App.Abacus.Main Compiling afresh Strat.App.Abacus.Main RunMu.exe: out of memory The binary is compiled without profiling, but in the first run I'm using the -h flag to get the rudimentary heap profile. And with -h it works, but without the flag it runs out of memory. Any bright ideas from the RTS experts on why this could happen? -- Lennart