diff --git a/src/libCom/osi/os/posix/osdSpin.c b/src/libCom/osi/os/posix/osdSpin.c
index 2b7c31c22..6ebc9f785 100644
--- a/src/libCom/osi/os/posix/osdSpin.c
+++ b/src/libCom/osi/os/posix/osdSpin.c
@@ -83,7 +83,7 @@ void epicsSpinLock(epicsSpinId spin) {
     status = pthread_spin_lock(&spin->lock);
     checkStatus(status, "pthread_spin_lock");
     if (status)
-        cantProceed("epicsSpinLock pspin");
+        cantProceed(NULL);
 }
 
 int epicsSpinTryLock(epicsSpinId spin) {
@@ -148,7 +148,7 @@ void epicsSpinLock(epicsSpinId spin) {
     status = pthread_mutex_lock(&spin->lock);
     checkStatus(status, "pthread_mutex_lock");
     if (status)
-        cantProceed("epicsSpinLock pmutex");
+        cantProceed(NULL);
 }
 
 int epicsSpinTryLock(epicsSpinId spin) {