diff --git a/bad-mutex/BadMutex.hpp b/bad-mutex/BadMutex.hpp
index 4cd2aeb..7525be3 100644
--- a/bad-mutex/BadMutex.hpp
+++ b/bad-mutex/BadMutex.hpp
@@ -4,6 +4,7 @@
 
 class BadMutex {
 	public:
+		const static unsigned int version = 0x000100;
 		static BadMutex& getInstance( void );
 		void lock( void );
 		void unlock( void );
diff --git a/bad-mutex/BadMutex.moon b/bad-mutex/BadMutex.moon
index 9575ab8..ff072e1 100644
--- a/bad-mutex/BadMutex.moon
+++ b/bad-mutex/BadMutex.moon
@@ -14,6 +14,11 @@ for path in *libraryPaths
 
 assert success, BM
 
+BMVersion = 0x000100
+libVer = BM.version!
+if libVer < BMVersion or math.floor(libVer/65536%256) > math.floor(BMVersion/65536%256)
+	error "Library version mismatch. Wanted #{BMVersion}, got #{libVer}."
+
 return {
 	lock: ->
 		BM.lock!
@@ -23,4 +28,6 @@ return {
 
 	unlock: ->
 		BM.unlock!
+
+	version: 0x000100
 }
diff --git a/bad-mutex/BadMutexC.cpp b/bad-mutex/BadMutexC.cpp
index 3ef620e..d1befe7 100644
--- a/bad-mutex/BadMutexC.cpp
+++ b/bad-mutex/BadMutexC.cpp
@@ -13,4 +13,8 @@ extern "C" {
 	EXPORT void unlock( void ) {
 		BadMutex::getInstance().unlock();
 	}
+
+	EXPORT unsigned int version( void ) {
+		return BadMutex::version;
+	}
 }
diff --git a/bad-mutex/BadMutexC.h b/bad-mutex/BadMutexC.h
index 6b0f289..5b6e1d7 100644
--- a/bad-mutex/BadMutexC.h
+++ b/bad-mutex/BadMutexC.h
@@ -14,6 +14,7 @@ extern "C" {
 EXPORT void lock( void );
 EXPORT bool try_lock( void );
 EXPORT void unlock( void );
+EXPORT unsigned int version( void );
 
 #ifdef __cplusplus
 }