Index: PGConnection.h
==================================================================
--- PGConnection.h
+++ PGConnection.h
@@ -18,12 +18,12 @@
 - (OFDictionary*)parameters;
 - (void)connect;
 - (void)reset;
 - (PGResult*)executeCommand: (OFConstantString*)command;
 - (PGResult*)executeCommand: (OFConstantString*)command
-		 parameters: (id)firstParameter, ...;
+		 parameters: (id)firstParameter, ... OF_SENTINEL;
 - (PGconn*)PG_connection;
 - (void)insertRow: (OFDictionary*)row
 	intoTable: (OFString*)table;
 - (void)insertRows: (OFArray*)rows
 	 intoTable: (OFString*)table;
 @end

Index: test.m
==================================================================
--- test.m
+++ test.m
@@ -32,11 +32,11 @@
 	[connection executeCommand: @"INSERT INTO test (id, name, content) "
 				    @"VALUES ($1, $2, $3)"
 			parameters: @1, @"foo", @"Hallo Welt!", nil];
 	[connection executeCommand: @"INSERT INTO test (id, content, success) "
 				    @"VALUES ($1, $2, $3)"
-			parameters: @2, @2, @YES];
+			parameters: @2, @2, @YES, nil];
 	[connection insertRow: @{ @"content": @"Hallo!", @"name": @"foo" }
 		    intoTable: @"test"];
 
 	result = [connection executeCommand: @"SELECT * FROM test"];
 	of_log(@"%@", result);