diff --git a/zend/parametersimpl.h b/zend/parametersimpl.h
index fa58d9fa..bf100c09 100644
--- a/zend/parametersimpl.h
+++ b/zend/parametersimpl.h
@@ -29,7 +29,7 @@ class ParametersImpl : public Parameters
         reserve(argc);
 
         // array to store all the arguments in
-        zval arguments[argc];
+        zval* arguments = static_cast<zval*>(alloca(argc * sizeof(zval)));
 
         // retrieve the arguments
         zend_get_parameters_array_ex(argc, arguments);
diff --git a/zend/value.cpp b/zend/value.cpp
index a50d4991..2043fb2b 100644
--- a/zend/value.cpp
+++ b/zend/value.cpp
@@ -884,7 +884,7 @@ Value Value::call(const char *name)
 Value Value::exec(int argc, Value *argv) const
 {
     // array of zvals to execute
-    zval params[argc];
+    zval* params = static_cast<zval*>(alloca(argc * sizeof(zval)));
 
     // convert all the values
     for(int i = 0; i < argc; i++) { params[i] = *argv[i]._val; }
@@ -906,7 +906,7 @@ Value Value::exec(const char *name, int argc, Value *argv) const
     Value method(name);
 
     // array of zvals to execute
-    zval params[argc];
+    zval* params = static_cast<zval*>(alloca(argc * sizeof(zval)));
 
     // convert all the values
     for(int i = 0; i < argc; i++) { params[i] = *argv[i]._val; }
@@ -928,7 +928,7 @@ Value Value::exec(const char *name, int argc, Value *argv)
     Value method(name);
 
     // array of zvals to execute
-    zval params[argc];
+    zval* params = static_cast<zval*>(alloca(argc * sizeof(zval)));
 
     // convert all the values
     for(int i = 0; i < argc; i++) { params[i] = *argv[i]._val; }