diff --git a/reactos/tools/ssprintf.cpp b/reactos/tools/ssprintf.cpp
index bd498df08d8..ff2b6d1fea3 100644
--- a/reactos/tools/ssprintf.cpp
+++ b/reactos/tools/ssprintf.cpp
@@ -41,7 +41,12 @@ inline int iswdigit ( wchar_t c )
 }
 #endif
 
-#if defined(__FreeBSD__) || defined(__APPLE__) || defined(__CYGWIN__)
+#if defined(__sun__)
+#include <alloca.h>
+#include <ieee.h>
+#endif
+
+#if defined(__FreeBSD__) || defined(__APPLE__) defined(__sun__) || defined(__CYGWIN__)
 # define __isnan isnan
 # define __finite finite
 # define powl __builtin_powl