diff --git a/doc/fixes34.3 b/doc/fixes34.3
index 9614676ef..9f6247141 100644
--- a/doc/fixes34.3
+++ b/doc/fixes34.3
@@ -64,6 +64,7 @@ prevent boulder option from accepting a symbol that matches a monster symbol
 traveling while standing on a trap would sometime step in the wrong direction
 avoid traveling into water/lava, using usual running rules
 unchanging iron golem would still rehumanize in a rust trap
+fix an impossible rndmonst: bad `mndx' bug
 
 
 Platform- and/or Interface-Specific Fixes
diff --git a/src/makemon.c b/src/makemon.c
index 123de5da1..a6cd84f42 100644
--- a/src/makemon.c
+++ b/src/makemon.c
@@ -1170,8 +1170,10 @@ rndmonst()
 
 	    rndmonst_state.choice_count = 0;
 	    /* look for first common monster */
-	    for (mndx = LOW_PM; mndx < SPECIAL_PM; mndx++)
+	    for (mndx = LOW_PM; mndx < SPECIAL_PM; mndx++) {
 		if (!uncommon(mndx)) break;
+		rndmonst_state.mchoices[mndx] = 0;
+	    }		
 	    if (mndx == SPECIAL_PM) {
 		/* evidently they've all been exterminated */
 #ifdef DEBUG