diff --git a/programs/bench.c b/programs/bench.c
index d25ff8f0..8d8ed4ff 100644
--- a/programs/bench.c
+++ b/programs/bench.c
@@ -146,8 +146,13 @@ typedef struct {
 } blockParam_t;
 
 
-#define MIN(a,b) ((a)<(b) ? (a) : (b))
-#define MAX(a,b) ((a)>(b) ? (a) : (b))
+
+#ifndef MIN
+#   define MIN(a,b)    ((a) < (b) ? (a) : (b))
+#endif
+#ifndef MAX
+#   define MAX(a,b)    ((a) > (b) ? (a) : (b))
+#endif
 
 static int BMK_benchMem(const void* srcBuffer, size_t srcSize,
                         const char* displayName, int cLevel,
diff --git a/programs/dibio.c b/programs/dibio.c
index b7ed280e..5e685a32 100644
--- a/programs/dibio.c
+++ b/programs/dibio.c
@@ -89,7 +89,9 @@ unsigned DiB_isError(size_t errorCode) { return ERR_isError(errorCode); }
 
 const char* DiB_getErrorName(size_t errorCode) { return ERR_getErrorName(errorCode); }
 
-#define MIN(a,b)   ( (a) < (b) ? (a) : (b) )
+#ifndef MIN
+#   define MIN(a,b)    ((a) < (b) ? (a) : (b))
+#endif
 
 
 /* ********************************************************
diff --git a/programs/fileio.c b/programs/fileio.c
index f1f5a557..1dc222b6 100644
--- a/programs/fileio.c
+++ b/programs/fileio.c
@@ -96,7 +96,9 @@ void FIO_setNotificationLevel(unsigned level) { g_displayLevel=level; }
 static const clock_t refreshRate = CLOCKS_PER_SEC * 15 / 100;
 static clock_t g_time = 0;
 
-#define MIN(a,b)    ((a) < (b) ? (a) : (b))
+#ifndef MIN
+#   define MIN(a,b)    ((a) < (b) ? (a) : (b))
+#endif
 
 /* ************************************************************
 * Avoid fseek()'s 2GiB barrier with MSVC, MacOS, *BSD, MinGW
diff --git a/programs/util.h b/programs/util.h
index 0b90cda1..104f8dad 100644
--- a/programs/util.h
+++ b/programs/util.h
@@ -569,7 +569,8 @@ UTIL_STATIC int UTIL_countPhysicalCores(void)
     static S32 numPhysicalCores; /* apple specifies int32_t */
     if (numPhysicalCores != 0) return numPhysicalCores;
 
-    {   int const ret = sysctlbyname("hw.physicalcpu", &numPhysicalCores, sizeof(int), NULL, 0);
+    {   size_t size = sizeof(S32);
+        int const ret = sysctlbyname("hw.physicalcpu", &numPhysicalCores, &size, NULL, 0);
         if (ret != 0) {
             if (errno == ENOENT) {
                 /* entry not present, fall back on 1 */