diff --git a/grpc_wrap.cc b/grpc_wrap.cc
index e37872a9f..7a32ad842 100644
--- a/grpc_wrap.cc
+++ b/grpc_wrap.cc
@@ -48,9 +48,11 @@
 #include <grpc/support/thd_id.h>
 
 #ifdef GRPC_SYS_SECURE
+#include <grpc/credentials.h>
 #include <grpc/grpc_security.h>
 #endif
 
+#include <stdio.h>
 #include <string.h>
 
 #ifdef GPR_WINDOWS
@@ -66,6 +68,19 @@
 #define GPR_CALLTYPE
 #endif
 
+#define GPR_ASSERT(x)                           \
+  do {                                          \
+    if (__builtin_expect(!(x), 0)) {            \
+      assertion_failed(__FILE__, __LINE__, #x); \
+    }                                           \
+  } while (0)
+
+static void __attribute__((noreturn)) assertion_failed(
+    const char* filename, int line, const char* message) {
+  fprintf(stderr, "%s:%d: ASSERTION FAILED: %s", filename, line, message);
+  abort();
+}
+
 grpc_byte_buffer* string_to_byte_buffer(const char* buffer, size_t len) {
   grpc_slice slice = grpc_slice_from_copied_buffer(buffer, len);
   grpc_byte_buffer* bb = grpc_raw_byte_buffer_create(&slice, 1);