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-rw-r--r--src/test/regress/pg_regress.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/test/regress/pg_regress.c b/src/test/regress/pg_regress.c
index 3c360d16352..d4f04a8a2c6 100644
--- a/src/test/regress/pg_regress.c
+++ b/src/test/regress/pg_regress.c
@@ -62,10 +62,10 @@ static char *shellprog = SHELLPROG;
*/
#ifndef WIN32
const char *basic_diff_opts = "";
-const char *pretty_diff_opts = "-C3";
+const char *pretty_diff_opts = "-U3";
#else
const char *basic_diff_opts = "-w";
-const char *pretty_diff_opts = "-w -C3";
+const char *pretty_diff_opts = "-w -U3";
#endif
/* options settable from command line */