diff --git a/dmd/struct.c b/dmd/struct.c
index 7d6d3936..7af158d0 100644
--- a/dmd/struct.c
+++ b/dmd/struct.c
@@ -151,7 +151,7 @@ void AggregateDeclaration::alignmember(
         unsigned size,          // alignment requirement of field
         unsigned *poffset)
 {
-    //printf("salign = %d, size = %d, offset = %d\n",salign,size,offset);
+    //printf("salign = %d, size = %d, offset = %d\n",salign,size, *poffset);
     if (salign > 1)
     {
         assert(size != 3);
@@ -160,7 +160,7 @@ void AggregateDeclaration::alignmember(
             sa = salign;
         *poffset = (*poffset + sa - 1) & ~(sa - 1);
     }
-    //printf("result = %d\n",offset);
+    //printf("result = %d\n", *poffset);
 }
 
 
diff --git a/gen/cl_options.cpp b/gen/cl_options.cpp
index cbb8c5c1..7d500aa3 100644
--- a/gen/cl_options.cpp
+++ b/gen/cl_options.cpp
@@ -100,6 +100,10 @@ cl::opt<bool> output_s("output-s",
 cl::opt<cl::boolOrDefault> output_o("output-o",
     cl::desc("Write native object"));
 
+// Disabling Red Zone
+cl::opt<bool> disableRedZone("disable-red-zone",
+  cl::desc("Do not emit code that uses the red zone."),
+  cl::init(false));
 
 // DDoc options
 static cl::opt<bool, true> doDdoc("D",
diff --git a/gen/cl_options.h b/gen/cl_options.h
index f7bf623a..8965a20e 100644
--- a/gen/cl_options.h
+++ b/gen/cl_options.h
@@ -26,6 +26,7 @@ namespace opts {
     extern cl::opt<bool> output_ll;
     extern cl::opt<bool> output_s;
     extern cl::opt<cl::boolOrDefault> output_o;
+    extern cl::opt<bool> disableRedZone;
     extern cl::opt<std::string> ddocDir;
     extern cl::opt<std::string> ddocFile;
     extern cl::opt<std::string> jsonFile;
diff --git a/gen/functions.cpp b/gen/functions.cpp
index d1aec882..c09806ec 100644
--- a/gen/functions.cpp
+++ b/gen/functions.cpp
@@ -22,6 +22,7 @@
 #include "gen/dvalue.h"
 #include "gen/abi.h"
 #include "gen/nested.h"
+#include "gen/cl_options.h"
 
 using namespace llvm::Attribute;
 
@@ -494,6 +495,9 @@ void DtoDeclareFunction(FuncDeclaration* fdecl)
     // parameter attributes
     if (!fdecl->isIntrinsic()) {
         set_param_attrs(f, func, fdecl);
+        if (opts::disableRedZone) {
+            func->addFnAttr(NoRedZone);
+        }
     }
 
     // main