diff --git a/tools/winebuild/build.h b/tools/winebuild/build.h
index 85309ad8a3a..b13b99406a4 100644
--- a/tools/winebuild/build.h
+++ b/tools/winebuild/build.h
@@ -116,7 +116,7 @@ enum target_cpu
 
 enum target_platform
 {
-    PLATFORM_UNSPECIFIED, PLATFORM_APPLE, PLATFORM_WINDOWS
+    PLATFORM_UNSPECIFIED, PLATFORM_APPLE, PLATFORM_SOLARIS, PLATFORM_WINDOWS
 };
 
 extern enum target_cpu target_cpu;
diff --git a/tools/winebuild/main.c b/tools/winebuild/main.c
index 82ee59dc9bf..3f2dcf214e5 100644
--- a/tools/winebuild/main.c
+++ b/tools/winebuild/main.c
@@ -65,6 +65,8 @@ enum target_cpu target_cpu = CPU_POWERPC;
 
 #ifdef __APPLE__
 enum target_platform target_platform = PLATFORM_APPLE;
+#elif defined(__sun)
+enum target_platform target_platform = PLATFORM_SOLARIS;
 #elif defined(_WINDOWS)
 enum target_platform target_platform = PLATFORM_WINDOWS;
 #else
@@ -124,6 +126,7 @@ static const struct
 {
     { "macos",   PLATFORM_APPLE },
     { "darwin",  PLATFORM_APPLE },
+    { "solaris", PLATFORM_SOLARIS },
     { "windows", PLATFORM_WINDOWS },
     { "winnt",   PLATFORM_WINDOWS }
 };