diff --git a/src/compat/process.c b/src/compat/process.c
index 3842e5d..48926e3 100644
--- a/src/compat/process.c
+++ b/src/compat/process.c
@@ -134,6 +134,7 @@ static int get_win_status(HANDLE handle) {
 #endif
 
 struct worker_context g_worker_context = {.test = NULL};
+unsigned long long g_ppid = 0;
 
 #ifdef VANILLA_WIN32
 struct full_context {
@@ -142,6 +143,7 @@ struct full_context {
     struct criterion_suite suite;
     struct criterion_test_extra_data suite_data;
     cr_worker_func func;
+    unsigned long long ppid;
     struct test_single_param param;
     HANDLE sync;
     DWORD extra_size;
@@ -207,6 +209,8 @@ static void *chld_pump_thread_main(void *nil) {
 
 void init_proc_compat(void) {
 #ifndef VANILLA_WIN32
+    g_ppid = get_process_id();
+
     child_pump_running = true;
     int err = pthread_create(&child_pump, NULL, chld_pump_thread_main, NULL);
     if (err) {
@@ -339,6 +343,8 @@ int resume_child(void) {
     local_ctx.test.data  = &local_ctx.test_data;
     local_ctx.suite.data = &local_ctx.suite_data;
 
+    g_ppid = local_ctx.ppid;
+
     SetEvent(local_ctx.sync);
 
     SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOGPFAULTERRORBOX);
@@ -411,6 +417,7 @@ s_proc_handle *fork_process() {
         .suite     = *g_worker_context.suite,
         .func      = g_worker_context.func,
         .sync      = sync,
+        .ppid      = get_process_id(),
     };
 
     if (g_worker_context.param) {
@@ -502,6 +509,14 @@ unsigned long long get_process_id(void) {
 #endif
 }
 
+unsigned long long get_runner_process_id(void) {
+#ifdef VANILLA_WIN32
+    return g_ppid;
+#else
+    return is_runner() ? get_process_id() : (unsigned long long) getppid();
+#endif
+}
+
 unsigned long long get_process_id_of(s_proc_handle *proc) {
 #ifdef VANILLA_WIN32
     return (unsigned long long) GetProcessId(proc->handle);
diff --git a/src/compat/process.h b/src/compat/process.h
index 20096ae..cc44a48 100644
--- a/src/compat/process.h
+++ b/src/compat/process.h
@@ -57,6 +57,7 @@ s_proc_handle *get_current_process();
 bool is_current_process(s_proc_handle *proc);
 
 unsigned long long get_process_id(void);
+unsigned long long get_runner_process_id(void);
 unsigned long long get_process_id_of(s_proc_handle *proc);
 
 void init_proc_compat(void);
diff --git a/src/protocol/connect.c b/src/protocol/connect.c
index b73d002..03e02fc 100644
--- a/src/protocol/connect.c
+++ b/src/protocol/connect.c
@@ -21,11 +21,15 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+#include <assert.h>
 #include <errno.h>
 #include <nanomsg/nn.h>
 #include <nanomsg/reqrep.h>
+#include <string.h>
 
-#define URL "ipc://criterion.sock"
+#include "compat/process.h"
+
+#define URL "ipc://%scriterion_%llu.sock"
 
 #define errno_ignore(Stmt) do { int err = errno; Stmt; errno = err; } while (0)
 
@@ -35,7 +39,17 @@ int bind_server(void) {
     if (sock < 0)
         return -1;
 
-    if (nn_bind(sock, URL) < 0)
+#ifdef VANILLA_WIN32
+    char *prefix = "";
+#else
+    char *prefix = "/tmp/";
+#endif
+
+    char url[256];
+    int rc = snprintf(url, sizeof (url), URL, prefix, get_process_id());
+    assert(rc < 256);
+
+    if (nn_bind(sock, url) < 0)
         goto error;
 
     return sock;
@@ -50,7 +64,17 @@ int connect_client(void) {
     if (sock < 0)
         return -1;
 
-    if (nn_connect (sock, URL) < 0)
+#ifdef VANILLA_WIN32
+    char *prefix = "";
+#else
+    char *prefix = "/tmp/";
+#endif
+
+    char url[256];
+    int rc = snprintf(url, sizeof (url), URL, prefix, get_runner_process_id());
+    assert(rc < 256);
+
+    if (nn_connect (sock, url) < 0)
         goto error;
 
     return sock;