diff -up mutt-1.12.1/init.h.optusegpgagent mutt-1.12.1/init.h
--- mutt-1.12.1/init.h.optusegpgagent	2019-08-29 09:29:38.868810511 +0200
+++ mutt-1.12.1/init.h	2019-08-29 09:30:29.899395370 +0200
@@ -2444,7 +2444,7 @@ struct option_t MuttVars[] = {
   ** not used.
   ** (PGP only)
   */
-  { "pgp_use_gpg_agent", DT_BOOL, R_NONE, {.l=OPTUSEGPGAGENT}, {.l=1} },
+  { "pgp_use_gpg_agent", DT_BOOL, R_NONE, {.l=OPTUSEGPGAGENT}, {.l=0} },
   /*
   ** .pp
   ** If \fIset\fP, mutt expects a \fCgpg-agent(1)\fP process will handle
