diff --git a/src/util.h b/src/util.h
index bee2749c1..3540cf512 100644
--- a/src/util.h
+++ b/src/util.h
@@ -102,6 +102,10 @@ T* alignup(T* p)
 #else
 #define MAX_PATH            1024
 #endif
+// As Solaris does not have the MSG_NOSIGNAL flag for send(2) syscall, it is defined as 0
+#ifndef MSG_NOSIGNAL
+#define MSG_NOSIGNAL 0
+#endif
 
 inline void MilliSleep(int64 n)
 {
@@ -499,6 +503,10 @@ inline void SetThreadPriority(int nPriority)
 }
 #else
 
+// PRIO_MAX is not defined on Solaris
+#ifndef PRIO_MAX
+    #define PRIO_MAX 20
+#endif
 #define THREAD_PRIORITY_LOWEST          PRIO_MAX
 #define THREAD_PRIORITY_BELOW_NORMAL    2
 #define THREAD_PRIORITY_NORMAL          0