diff --git a/src/test/isolation/README b/src/test/isolation/README
index bea278a856..780b6dca1b 100644
--- a/src/test/isolation/README
+++ b/src/test/isolation/README
@@ -108,8 +108,8 @@ Each step may contain commands that block until further action has been taken
 deadlock).  A test that uses this ability must manually specify valid
 permutations, i.e. those that would not expect a blocked session to execute a
 command.  If a test fails to follow that rule, isolationtester will cancel it
-after 60 seconds.  If the cancel doesn't work, isolationtester will exit
-uncleanly after a total of 75 seconds of wait time.  Testing invalid
+after 180 seconds.  If the cancel doesn't work, isolationtester will exit
+uncleanly after a total of 200 seconds of wait time.  Testing invalid
 permutations should be avoided because they can make the isolation tests take
 a very long time to run, and they serve no useful testing purpose.
 
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 4f0c8ad4a8..f6316ad52a 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -768,15 +768,15 @@ try_complete_step(Step *step, int flags)
 			td += (int64) current_time.tv_usec - (int64) start_time.tv_usec;
 
 			/*
-			 * After 60 seconds, try to cancel the query.
+			 * After 180 seconds, try to cancel the query.
 			 *
 			 * If the user tries to test an invalid permutation, we don't want
 			 * to hang forever, especially when this is running in the
-			 * buildfarm.  So try to cancel it after a minute.  This will
-			 * presumably lead to this permutation failing, but remaining
-			 * permutations and tests should still be OK.
+			 * buildfarm.  This will presumably lead to this permutation
+			 * failing, but remaining permutations and tests should still be
+			 * OK.
 			 */
-			if (td > 60 * USECS_PER_SEC && !canceled)
+			if (td > 180 * USECS_PER_SEC && !canceled)
 			{
 				PGcancel   *cancel = PQgetCancel(conn);
 
@@ -793,15 +793,15 @@ try_complete_step(Step *step, int flags)
 			}
 
 			/*
-			 * After 75 seconds, just give up and die.
+			 * After 200 seconds, just give up and die.
 			 *
 			 * Since cleanup steps won't be run in this case, this may cause
 			 * later tests to fail.  That stinks, but it's better than waiting
 			 * forever for the server to respond to the cancel.
 			 */
-			if (td > 75 * USECS_PER_SEC)
+			if (td > 200 * USECS_PER_SEC)
 			{
-				fprintf(stderr, "step %s timed out after 75 seconds\n",
+				fprintf(stderr, "step %s timed out after 200 seconds\n",
 						step->name);
 				exit_nicely();
 			}