diff --git a/ProcessUNIX.c b/ProcessUNIX.c
index 661d7440b9ce70b59e21ea89c2bc9b85fa71cb76..c8a3d1db532e98350ed41647f08983345a721c80 100644
--- a/ProcessUNIX.c
+++ b/ProcessUNIX.c
@@ -1476,7 +1476,9 @@ static void kwsysProcessSetExitException(kwsysProcess* cp, int sig)
     case SIGSEGV: KWSYSPE_CASE(Fault, "Segmentation fault"); break;
 #endif
 #ifdef SIGBUS
+# if !defined(SIGSEGV) || SIGBUS != SIGSEGV
     case SIGBUS: KWSYSPE_CASE(Fault, "Bus error"); break;
+# endif
 #endif
 #ifdef SIGFPE
     case SIGFPE: KWSYSPE_CASE(Numerical, "Floating-point exception"); break;