diff --git a/src/cmd/acid/main.c b/src/cmd/acid/main.c
index 89bca4c3..712831c0 100644
--- a/src/cmd/acid/main.c
+++ b/src/cmd/acid/main.c
@@ -77,6 +77,7 @@ main(int argc, char *argv[])
 	bout = &bioout;
 
 	initexpr();
+	initprint();
 	kinit();
 	initialising = 1;
 	pushfile(0);
diff --git a/src/cmd/acid/proc.c b/src/cmd/acid/proc.c
index 2c286e15..2f8b9dd9 100644
--- a/src/cmd/acid/proc.c
+++ b/src/cmd/acid/proc.c
@@ -29,6 +29,7 @@ sproc(int xpid)
 	free(correg);
 	correg = nil;
 
+fprint(2, "mapproc %d\n", xpid);
 	if(mapproc(xpid, cormap, &correg) < 0)
 		error("setproc %d: %r", pid);