diff --git a/ext/ffi/ffi.g b/ext/ffi/ffi.g
index 80b41fddc3c..9ffe3c5fa64 100644
--- a/ext/ffi/ffi.g
+++ b/ext/ffi/ffi.g
@@ -92,7 +92,7 @@ declarations:
 ;
 
 declaration_specifiers(zend_ffi_dcl *dcl):
-	(	?{sym != YY_ID || zend_ffi_is_typedef_name((const char*)yy_text, yy_pos - yy_text)}
+	(	?{sym != YY_ID || !(dcl->flags & ZEND_FFI_DCL_TYPE_SPECIFIERS)}
 		(	{if (dcl->flags & ZEND_FFI_DCL_STORAGE_CLASS) yy_error_sym("unexpected", sym);}
 			"typedef"
 			{dcl->flags |= ZEND_FFI_DCL_TYPEDEF;}
diff --git a/ext/ffi/ffi_parser.c b/ext/ffi/ffi_parser.c
index 1606bef16f0..31caef6bf56 100644
--- a/ext/ffi/ffi_parser.c
+++ b/ext/ffi/ffi_parser.c
@@ -3588,7 +3588,7 @@ static int parse_declaration_specifiers(int sym, zend_ffi_dcl *dcl) {
 			default:
 				yy_error_sym("unexpected", sym);
 		}
-	} while ((YY_IN_SET(sym, (YY_TYPEDEF,YY_EXTERN,YY_STATIC,YY_AUTO,YY_REGISTER,YY_INLINE,YY___INLINE,YY___INLINE__,YY__NORETURN,YY___CDECL,YY___STDCALL,YY___FASTCALL,YY___THISCALL,YY__ALIGNAS,YY___ATTRIBUTE,YY___ATTRIBUTE__,YY___DECLSPEC,YY_CONST,YY___CONST,YY___CONST__,YY_RESTRICT,YY___RESTICT,YY___RESTRICT__,YY_VOLATILE,YY___VOLATILE,YY___VOLATILE__,YY__ATOMIC,YY_VOID,YY_CHAR,YY_SHORT,YY_INT,YY_LONG,YY_FLOAT,YY_DOUBLE,YY_SIGNED,YY_UNSIGNED,YY__BOOL,YY__COMPLEX,YY_COMPLEX,YY___COMPLEX,YY___COMPLEX__,YY_STRUCT,YY_UNION,YY_ENUM,YY_ID), "\370\377\371\377\377\037\301\001\000\000\040\000")) && (sym != YY_ID || zend_ffi_is_typedef_name((const char*)yy_text, yy_pos - yy_text)));
+	} while ((YY_IN_SET(sym, (YY_TYPEDEF,YY_EXTERN,YY_STATIC,YY_AUTO,YY_REGISTER,YY_INLINE,YY___INLINE,YY___INLINE__,YY__NORETURN,YY___CDECL,YY___STDCALL,YY___FASTCALL,YY___THISCALL,YY__ALIGNAS,YY___ATTRIBUTE,YY___ATTRIBUTE__,YY___DECLSPEC,YY_CONST,YY___CONST,YY___CONST__,YY_RESTRICT,YY___RESTICT,YY___RESTRICT__,YY_VOLATILE,YY___VOLATILE,YY___VOLATILE__,YY__ATOMIC,YY_VOID,YY_CHAR,YY_SHORT,YY_INT,YY_LONG,YY_FLOAT,YY_DOUBLE,YY_SIGNED,YY_UNSIGNED,YY__BOOL,YY__COMPLEX,YY_COMPLEX,YY___COMPLEX,YY___COMPLEX__,YY_STRUCT,YY_UNION,YY_ENUM,YY_ID), "\370\377\371\377\377\037\301\001\000\000\040\000")) && (sym != YY_ID || !(dcl->flags & ZEND_FFI_DCL_TYPE_SPECIFIERS)));
 	return sym;
 }
 
diff --git a/ext/ffi/tests/043.phpt b/ext/ffi/tests/043.phpt
new file mode 100644
index 00000000000..f4400a9adc9
--- /dev/null
+++ b/ext/ffi/tests/043.phpt
@@ -0,0 +1,19 @@
+--TEST--
+FFI 043: Type redeclaration
+--SKIPIF--
+<?php require_once('skipif.inc'); ?>
+--INI--
+ffi.enable=1
+--FILE--
+<?php
+FFI::cdef("
+typedef int a;
+typedef unsigned int a;
+");
+?>
+--EXPECTF--
+Fatal error: Uncaught FFI\ParserException: redeclaration of 'a' at line 3 in %s043.php:2
+Stack trace:
+#0 %s043.php(2): FFI::cdef('%s')
+#1 {main}
+  thrown in %s043.php on line 2