diff --git a/contrib/postgres_fdw/deparse.c b/contrib/postgres_fdw/deparse.c
index a748b7afea1..032a34bc806 100644
--- a/contrib/postgres_fdw/deparse.c
+++ b/contrib/postgres_fdw/deparse.c
@@ -316,7 +316,7 @@ foreign_expr_walker(Node *node,
 			break;
 		case T_ArrayRef:
 			{
-				ArrayRef   *ar = (ArrayRef *) node;;
+				ArrayRef   *ar = (ArrayRef *) node;
 
 				/* Assignment should not be in restrictions. */
 				if (ar->refassgnexpr != NULL)
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 3fcb3cbd7c0..eec10fc48c1 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -13648,7 +13648,7 @@ makeRangeVarFromAnyName(List *names, int position, core_yyscan_t yyscanner)
 			r->relname = strVal(lsecond(names));
 			break;
 		case 3:
-			r->catalogname = strVal(linitial(names));;
+			r->catalogname = strVal(linitial(names));
 			r->schemaname = strVal(lsecond(names));
 			r->relname = strVal(lthird(names));
 			break;
diff --git a/src/backend/utils/adt/json.c b/src/backend/utils/adt/json.c
index aa197f74142..0566b926fed 100644
--- a/src/backend/utils/adt/json.c
+++ b/src/backend/utils/adt/json.c
@@ -154,7 +154,7 @@ static inline void
 lex_expect(JsonParseContext ctx, JsonLexContext *lex, JsonTokenType token)
 {
 	if (!lex_accept(lex, token, NULL))
-		report_parse_error(ctx, lex);;
+		report_parse_error(ctx, lex);
 }
 
 /* chars to consider as part of an alphanumeric token */
diff --git a/src/backend/utils/adt/oracle_compat.c b/src/backend/utils/adt/oracle_compat.c
index d448088e50e..1f4f58d911d 100644
--- a/src/backend/utils/adt/oracle_compat.c
+++ b/src/backend/utils/adt/oracle_compat.c
@@ -955,7 +955,7 @@ chr			(PG_FUNCTION_ARGS)
 		if (bytes == 2)
 		{
 			wch[0] = 0xC0 | ((cvalue >> 6) & 0x1F);
-			wch[1] = 0x80 | (cvalue & 0x3F);;
+			wch[1] = 0x80 | (cvalue & 0x3F);
 		}
 		else if (bytes == 3)
 		{