diff --git a/base/client.jl b/base/client.jl
index 3518498795e83..dd67b6f85248f 100644
--- a/base/client.jl
+++ b/base/client.jl
@@ -129,6 +129,11 @@ end
 
 _repl_start = Condition()
 
+function syntax_deprecation_warnings(warn::Bool)
+    ccall(:jl_parse_depwarn, Void, (Cint,), warn)
+    warn
+end
+
 function parse_input_line(s::AbstractString)
     # s = bytestring(s)
     # (expr, pos) = parse(s, 1)
diff --git a/base/util.jl b/base/util.jl
index 2269303af4b85..2ceffd09ac738 100644
--- a/base/util.jl
+++ b/base/util.jl
@@ -241,3 +241,18 @@ end
 
 warn(err::Exception; prefix="ERROR: ", kw...) =
     warn(sprint(io->showerror(io,err)), prefix=prefix; kw...)
+
+# Julia compiler options struct
+immutable JLCompilerOpts
+    build_path::Ptr{Cchar}
+    code_coverage::Int8
+    malloc_log::Int8
+    check_bounds::Int8
+    dumpbitcode::Int8
+    int_literals::Cint
+    compile_enabled::Int8
+    opt_level::Int8
+    no_depwarn::Int8
+end
+
+compileropts() = unsafe_load(cglobal(:jl_compileropts, JLCompilerOpts))
diff --git a/src/ast.c b/src/ast.c
index f743641d1cf73..433d9608f7429 100644
--- a/src/ast.c
+++ b/src/ast.c
@@ -114,6 +114,8 @@ static builtinspec_t julia_flisp_ast_ext[] = {
     { NULL, NULL }
 };
 
+extern void jl_parse_depwarn(int warn);
+
 DLLEXPORT void jl_init_frontend(void)
 {
     fl_init(4*1024*1024);
@@ -136,6 +138,9 @@ DLLEXPORT void jl_init_frontend(void)
     false_sym = symbol("false");
     fl_error_sym = symbol("error");
     fl_null_sym = symbol("null");
+
+    // Enable / disable syntax deprecation warnings
+    jl_parse_depwarn((int)jl_compileropts.depwarn);
 }
 
 DLLEXPORT void jl_lisp_prompt(void)
@@ -507,6 +512,11 @@ void jl_stop_parsing(void)
     fl_applyn(0, symbol_value(symbol("jl-parser-close-stream")));
 }
 
+DLLEXPORT void jl_parse_depwarn(int warn)
+{
+    fl_applyn(1, symbol_value(symbol("jl-parser-depwarn")), warn? FL_T : FL_F);
+}
+
 extern int jl_lineno;
 
 jl_value_t *jl_parse_next(void)
diff --git a/src/init.c b/src/init.c
index 5c758b144197b..865e5a62ca9ef 100644
--- a/src/init.c
+++ b/src/init.c
@@ -87,7 +87,8 @@ jl_compileropts_t jl_compileropts = { NULL, // build_path
                                       JL_COMPILEROPT_DUMPBITCODE_OFF,
                                       0,    // int_literals
                                       JL_COMPILEROPT_COMPILE_DEFAULT,
-                                      0     // opt_level
+                                      0,    // opt_level
+                                      1,    // depwarn
 };
 
 int jl_boot_file_loaded = 0;
diff --git a/src/jlfrontend.scm b/src/jlfrontend.scm
index e32c05a35aa20..10296ef5bd451 100644
--- a/src/jlfrontend.scm
+++ b/src/jlfrontend.scm
@@ -187,6 +187,10 @@
   (set! *filename-stack* (cdr *filename-stack*))
   (set! *ts-stack* (cdr *ts-stack*)))
 
+(define *depwarn* #t)
+(define (jl-parser-depwarn w)
+  (set! *depwarn* (eq? w #t)))
+
 (define (jl-parser-next)
   (let* ((err (parser-wrap
 	       (lambda ()
diff --git a/src/julia-parser.scm b/src/julia-parser.scm
index 5e3714f8dd15b..b9e4826cba807 100644
--- a/src/julia-parser.scm
+++ b/src/julia-parser.scm
@@ -501,17 +501,18 @@
 ;; --- misc ---
 
 (define (syntax-deprecation-warning s what instead)
-  (io.write
-   *stderr*
-   (string
-    #\newline "WARNING: deprecated syntax \"" what "\""
-    (if (eq? current-filename 'none)
-	""
-	(string " at " current-filename ":" (input-port-line (ts:port s))))
-    "."
-    (if (equal? instead "")
-	""
-	(string #\newline "Use \"" instead "\" instead." #\newline)))))
+  (if *depwarn*
+    (io.write
+     *stderr*
+     (string
+      #\newline "WARNING: deprecated syntax \"" what "\""
+      (if (eq? current-filename 'none)
+	  ""
+	  (string " at " current-filename ":" (input-port-line (ts:port s))))
+      "."
+      (if (equal? instead "")
+	  ""
+	  (string #\newline "Use \"" instead "\" instead." #\newline))))))
 
 ;; --- parser ---
 
diff --git a/src/julia.h b/src/julia.h
index 5311e5a321893..464b79888b117 100644
--- a/src/julia.h
+++ b/src/julia.h
@@ -872,6 +872,7 @@ void jl_init_restored_modules();
 // front end interface
 DLLEXPORT jl_value_t *jl_parse_input_line(const char *str);
 DLLEXPORT jl_value_t *jl_parse_string(const char *str, int pos0, int greedy);
+DLLEXPORT void jl_parse_depwarn(int warn);
 int jl_start_parsing_file(const char *fname);
 void jl_stop_parsing(void);
 jl_value_t *jl_parse_next(void);
@@ -1336,6 +1337,7 @@ typedef struct {
     int int_literals;
     int8_t compile_enabled;
     int8_t opt_level;
+    int8_t depwarn;
 } jl_compileropts_t;
 
 extern DLLEXPORT jl_compileropts_t jl_compileropts;
diff --git a/ui/repl.c b/ui/repl.c
index 31634902aacbc..74a23da8a316c 100644
--- a/ui/repl.c
+++ b/ui/repl.c
@@ -87,7 +87,8 @@ static const char *opts =
     " --check-bounds={yes|no}  Emit bounds checks always or never (ignoring declarations)\n"
     " -O, --optimize           Run time-intensive code optimizations\n"
     " --int-literals={32|64}   Select integer literal size independent of platform\n"
-    " --dump-bitcode={yes|no}  Dump bitcode for the system image (used with --build)\n";
+    " --dump-bitcode={yes|no}  Dump bitcode for the system image (used with --build)\n"
+    " --no-depwarn             Turn off deprecated syntax warnings\n";
 
 void parse_opts(int *argcp, char ***argvp)
 {
@@ -106,6 +107,7 @@ void parse_opts(int *argcp, char ***argvp)
         { "int-literals",  required_argument, 0, 301 },
         { "dump-bitcode",  required_argument, 0, 302 },
         { "compile",       required_argument, 0, 303 },
+        { "no-depwarn",    optional_argument, 0, 304 },
         { 0, 0, 0, 0 }
     };
     int c;
@@ -198,6 +200,9 @@ void parse_opts(int *argcp, char ***argvp)
                 exit(1);
             }
             break;
+	case 304:
+	    jl_compileropts.depwarn = 0;
+	    break;
         default:
             ios_printf(ios_stderr, "julia: unhandled option -- %c\n",  c);
             ios_printf(ios_stderr, "This is a bug, please report it.\n");