diff --git a/test/webkit/fast/js/deep-recursion-test.js b/test/webkit/fast/js/deep-recursion-test.js
index c0a3b26c30..b0b7e78109 100644
--- a/test/webkit/fast/js/deep-recursion-test.js
+++ b/test/webkit/fast/js/deep-recursion-test.js
@@ -21,6 +21,9 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+// This neuters too low stack size passed by the flag fuzzer.
+// Flags: --stack-size=864
+
 description("This test how deep we can recurse, and that we get an exception when we do, as opposed to a stack overflow.");
 
     function simpleRecursion(depth) {
diff --git a/test/webkit/fast/js/function-apply.js b/test/webkit/fast/js/function-apply.js
index 14a65646b3..407c101add 100644
--- a/test/webkit/fast/js/function-apply.js
+++ b/test/webkit/fast/js/function-apply.js
@@ -21,6 +21,9 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+// This neuters too low stack size passed by the flag fuzzer.
+// Flags: --stack-size=864
+
 description('Tests to ensure that Function.apply works correctly for Arrays, arguments and array-like objects.');
 
 function argumentsApply1(a, b, c)
diff --git a/test/webkit/function-call-register-allocation.js b/test/webkit/function-call-register-allocation.js
index 8873bdec43..d8a6e2a14e 100644
--- a/test/webkit/function-call-register-allocation.js
+++ b/test/webkit/function-call-register-allocation.js
@@ -21,6 +21,9 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+// This neuters too low stack size passed by the flag fuzzer.
+// Flags: --stack-size=864
+
 description(
 "This test checks for a specific regression that caused function calls to allocate too many temporary registers."
 );
diff --git a/test/webkit/run-json-stringify.js b/test/webkit/run-json-stringify.js
index 51323b9b3a..41c89228e0 100644
--- a/test/webkit/run-json-stringify.js
+++ b/test/webkit/run-json-stringify.js
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// This neuters too low stack size passed by the flag fuzzer.
+// Flags: --stack-size=864
+
 var nativeJSON = this.JSON;
 this.JSON = null;
 d8.file.execute("test/webkit/resources/json2-es5-compat.js");