diff --git a/src/backend/commands/explain.c b/src/backend/commands/explain.c
index e4621ef8d6..5212a64b1e 100644
--- a/src/backend/commands/explain.c
+++ b/src/backend/commands/explain.c
@@ -3324,7 +3324,7 @@ show_hashagg_info(AggState *aggstate, ExplainState *es)
 			if (!gotone)
 				ExplainIndentText(es);
 			else
-				appendStringInfoString(es->str, "  ");
+				appendStringInfoSpaces(es->str, 2);
 
 			appendStringInfo(es->str, "Batches: %d  Memory Usage: " INT64_FORMAT "kB",
 							 aggstate->hash_batches_used, memPeakKb);
diff --git a/src/backend/utils/adt/jsonb.c b/src/backend/utils/adt/jsonb.c
index 4ff2eced4c..0539f41c17 100644
--- a/src/backend/utils/adt/jsonb.c
+++ b/src/backend/utils/adt/jsonb.c
@@ -626,11 +626,8 @@ add_indent(StringInfo out, bool indent, int level)
 {
 	if (indent)
 	{
-		int			i;
-
 		appendStringInfoCharMacro(out, '\n');
-		for (i = 0; i < level; i++)
-			appendBinaryStringInfo(out, "    ", 4);
+		appendStringInfoSpaces(out, level * 4);
 	}
 }
 
diff --git a/src/common/stringinfo.c b/src/common/stringinfo.c
index b3d3c99b8c..05b22b5c53 100644
--- a/src/common/stringinfo.c
+++ b/src/common/stringinfo.c
@@ -211,8 +211,8 @@ appendStringInfoSpaces(StringInfo str, int count)
 		enlargeStringInfo(str, count);
 
 		/* OK, append the spaces */
-		while (--count >= 0)
-			str->data[str->len++] = ' ';
+		memset(&str->data[str->len], ' ', count);
+		str->len += count;
 		str->data[str->len] = '\0';
 	}
 }