diff --git a/src/info.c b/src/info.c
index db656a3a7..7d329a35b 100644
--- a/src/info.c
+++ b/src/info.c
@@ -29019,7 +29019,7 @@ void P_PatchInfoTables(void)
 	INT32 i;
 	char *tempname;
 
-#if NUMSPRITEFREESLOTS > 1000
+#if NUMSPRITEFREESLOTS > 9999 //tempname numbering actually starts at SPR_FIRSTFREESLOT, so the limit is actually 9999 + SPR_FIRSTFREESLOT-1, but the preprocessor doesn't understand enums, so its left at 9999 for safety
 #error "Update P_PatchInfoTables, you big dumb head"
 #endif
 
@@ -29027,8 +29027,8 @@ void P_PatchInfoTables(void)
 	for (i = SPR_FIRSTFREESLOT; i <= SPR_LASTFREESLOT; i++)
 	{
 		tempname = sprnames[i];
-		tempname[0] = 'F';
-		tempname[1] = (char)('0' + (char)((i-SPR_FIRSTFREESLOT+1)/100));
+		tempname[0] = (char)('0' + (char)((i-SPR_FIRSTFREESLOT+1)/1000));
+		tempname[1] = (char)('0' + (char)(((i-SPR_FIRSTFREESLOT+1)/100)%10));
 		tempname[2] = (char)('0' + (char)(((i-SPR_FIRSTFREESLOT+1)/10)%10));
 		tempname[3] = (char)('0' + (char)((i-SPR_FIRSTFREESLOT+1)%10));
 		tempname[4] = '\0';