diff --git a/deps/src/shim.c b/deps/src/shim.c
index 7d8d387..fa7df80 100644
--- a/deps/src/shim.c
+++ b/deps/src/shim.c
@@ -3,6 +3,8 @@
 #include <stdio.h>
 #include <unistd.h>
 
+#define SHIM_REVISION 2
+
 int paCallback(const void *inputBuffer, void *outputBuffer,
                unsigned long framesPerBuffer,
                const PaStreamCallbackTimeInfo* timeInfo,
@@ -31,6 +33,11 @@ void synchronize_buffer(void *buffer)
     sem_post(&CSemaphore);
 }
 
+int get_shim_revision(void)
+{
+    return SHIM_REVISION;
+}
+
 PaError open_stream(unsigned int sampleRate, unsigned int bufSize)
 {
     PaError err;
diff --git a/deps/usr/lib/libportaudio_shim.so b/deps/usr/lib/libportaudio_shim.so
index 6484f3c..241ee16 100755
Binary files a/deps/usr/lib/libportaudio_shim.so and b/deps/usr/lib/libportaudio_shim.so differ
diff --git a/src/portaudio.jl b/src/portaudio.jl
index 7387f7e..be7e13f 100644
--- a/src/portaudio.jl
+++ b/src/portaudio.jl
@@ -8,6 +8,8 @@ typealias PaTime Cdouble
 typealias PaHostApiTypeId Cint
 
 const PA_NO_ERROR = 0
+# expected shim revision, so we can notify if it gets out of sync
+const SHIM_REVISION = 2
 const libportaudio_shim = find_library(["libportaudio_shim",],
         [Pkg.dir("AudioIO", "deps", "usr", "lib"),])
 
@@ -60,6 +62,10 @@ function open_portaudio_stream(stream::PortAudioStream)
 
     # TODO: handle more streams
 
+    shim_rev = ccall((:get_shim_revision, libportaudio_shim), Cint, ())
+    if shim_rev != SHIM_REVISION
+        error("Expected shim revision $SHIM_REVISION, got $shim_rev. Run 'make' from AudioIO/deps/src")
+    end
     fd = ccall((:make_pipe, libportaudio_shim), Cint, ())
 
     info("Launching PortAudio Task...")