diff --git a/src/librustc/back/passes.rs b/src/librustc/back/passes.rs
index 07e5d9e4f25a0e936d30e48585b320cd3f521e69..987c76dccb4242a80d7cc38a55b64477be9907e3 100644
--- a/src/librustc/back/passes.rs
+++ b/src/librustc/back/passes.rs
@@ -299,18 +299,27 @@ fn passes_exist() {
     let mut failed = ~[];
     unsafe { llvm::LLVMInitializePasses(); }
     for analysis_passes.each() |&(name,_)| {
-        if !create_pass(name).is_some() {
+        let pass = create_pass(name);
+        if !pass.is_some() {
             failed.push(name);
+        } else {
+            unsafe { llvm::LLVMDestroyPass(pass.get()) }
         }
     }
     for transform_passes.each() |&(name,_)| {
-        if !create_pass(name).is_some() {
+        let pass = create_pass(name);
+        if !pass.is_some() {
             failed.push(name);
+        } else {
+            unsafe { llvm::LLVMDestroyPass(pass.get()) }
         }
     }
     for utility_passes.each() |&(name,_)| {
-        if !create_pass(name).is_some() {
+        let pass = create_pass(name);
+        if !pass.is_some() {
             failed.push(name);
+        } else {
+            unsafe { llvm::LLVMDestroyPass(pass.get()) }
         }
     }
 
diff --git a/src/librustc/lib/llvm.rs b/src/librustc/lib/llvm.rs
index 835dd55711b5739d181e65f1f1f02b5419a9a9ed..2b2c1e27cbc3d9f0b7d5e2d5dc8584477290abf0 100644
--- a/src/librustc/lib/llvm.rs
+++ b/src/librustc/lib/llvm.rs
@@ -1684,6 +1684,9 @@ pub unsafe fn LLVMRunPassManager(PM: PassManagerRef,
         #[fast_ffi]
         pub unsafe fn LLVMCreatePass(PassName:*c_char) -> PassRef;
 
+        #[fast_ffi]
+        pub unsafe fn LLVMDestroyPass(P: PassRef);
+
         /** Adds a verification pass. */
         #[fast_ffi]
         pub unsafe fn LLVMAddVerifierPass(PM: PassManagerRef);
diff --git a/src/rustllvm/PassWrapper.cpp b/src/rustllvm/PassWrapper.cpp
index 53b291ff470d196e67866277fbc5937d2adc6602..32b6df4e1dd595c572d1cab9a45b3731750798aa 100644
--- a/src/rustllvm/PassWrapper.cpp
+++ b/src/rustllvm/PassWrapper.cpp
@@ -63,3 +63,8 @@ extern "C" LLVMPassRef LLVMCreatePass(const char * PassName) {
         return (LLVMPassRef)0;
     }
 }
+
+extern "C" void LLVMDestroyPass(LLVMPassRef PassRef) {
+    Pass *p = unwrap(PassRef);
+    delete p;
+}
diff --git a/src/rustllvm/rustllvm.def.in b/src/rustllvm/rustllvm.def.in
index 2a3f7de9bf5a07659ba2ef9b74c50c71a531090e..d5f03ac604b7605724c4aa70a33ca3b9e9a7a180 100644
--- a/src/rustllvm/rustllvm.def.in
+++ b/src/rustllvm/rustllvm.def.in
@@ -588,6 +588,7 @@ LLVMInlineAsm
 LLVMInitializePasses
 LLVMAddPass
 LLVMCreatePass
+LLVMDestroyPass
 LLVMDIBuilderCreate
 LLVMDIBuilderDispose
 LLVMDIBuilderFinalize