--- src/class_main.cpp.old	2023-02-03 07:02:16.523174913 +0100
+++ src/class_main.cpp	2023-02-03 07:03:26.899163768 +0100
@@ -422,7 +422,7 @@
  */
 		if (log == TRUE)
 		{
-			if (!phrq_io->log_open("phreeqc.log"))
+			if (!phrq_io->log_open("/tmp/phreeqc.log"))
 			{
 				error_msg("Cannot open log file, phreeqc.log.", STOP);
 			}