diff --git a/cbackend.cpp b/cbackend.cpp
index b433240e..f5fa85c7 100644
--- a/cbackend.cpp
+++ b/cbackend.cpp
@@ -71,7 +71,11 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FormattedStream.h"
 #include "llvm/Support/GetElementPtrTypeIterator.h"
-#include "llvm/Support/InstVisitor.h"
+#if defined(LLVM_3_3)
+  #include "llvm/InstVisitor.h"
+#else
+  #include "llvm/Support/InstVisitor.h"
+#endif
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Support/Host.h"
diff --git a/ispc.cpp b/ispc.cpp
index e5a287e7..af066063 100644
--- a/ispc.cpp
+++ b/ispc.cpp
@@ -129,9 +129,9 @@ lGetSystemISA() {
 
 static const char *supportedCPUs[] = { 
     "atom", "penryn", "core2", "corei7", "corei7-avx"
-#ifdef LLVM_3_2
+#if defined(LLVM_3_2) || defined(LLVM_3_3)
     , "core-avx-i", "core-avx2"
-#endif // LLVM_3_2
+#endif // LLVM_3_2 or LLVM_3_3
 };
 
 
diff --git a/ispc.h b/ispc.h
index 045916ab..40436d7c 100644
--- a/ispc.h
+++ b/ispc.h
@@ -40,8 +40,8 @@
 
 #define ISPC_VERSION "1.3.1dev"
 
-#if !defined(LLVM_3_0) && !defined(LLVM_3_1) && !defined(LLVM_3_2)
-#error "Only LLVM 3.0, 3.1, and the 3.2 development branch are supported"
+#if !defined(LLVM_3_0) && !defined(LLVM_3_1) && !defined(LLVM_3_2) && !defined(LLVM_3_3)
+#error "Only LLVM 3.0, 3.1, 3.2, and the 3.3 development branch are supported"
 #endif
 
 #if defined(_WIN32) || defined(_WIN64)
diff --git a/main.cpp b/main.cpp
index 8076456f..70dfb5b6 100644
--- a/main.cpp
+++ b/main.cpp
@@ -68,6 +68,8 @@ lPrintVersion() {
            "3.1"
 #elif defined(LLVM_3_2)
            "3.2"
+#elif defined(LLVM_3_3)
+           "3.3"
 #else
 #error "Unhandled LLVM version"
 #endif