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-rw-r--r--rts/Profiling.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/rts/Profiling.c b/rts/Profiling.c
index f340a63cff..b91129ed98 100644
--- a/rts/Profiling.c
+++ b/rts/Profiling.c
@@ -263,7 +263,7 @@ initProfilingLogFile(void)
sprintf(prof_filename, "%s.prof", stem);
/* open the log file */
- if ((prof_file = __rts_fopen(prof_filename, "w")) == NULL) {
+ if ((prof_file = __rts_fopen(prof_filename, "w+")) == NULL) {
debugBelch("Can't open profiling report file %s\n", prof_filename);
RtsFlags.CcFlags.doCostCentres = 0;
// Retainer profiling (`-hr` or `-hr<cc> -h<x>`) writes to