diff --git a/src/bin/addattr/main.cpp b/src/bin/addattr/main.cpp
index 2f439c1daa..a207917c8e 100644
--- a/src/bin/addattr/main.cpp
+++ b/src/bin/addattr/main.cpp
@@ -29,8 +29,14 @@ static struct option const kLongOptions[] = {
 };
 
 
+#ifndef HAIKU_HOST_PLATFORM_SUNOS
 extern const char *__progname;
+#endif
+#ifdef HAIKU_HOST_PLATFORM_SUNOS
+static const char *kProgramName = "addattr";
+#else
 static const char *kProgramName = __progname;
+#endif
 
 
 // supported types (if you add any, make sure that writeAttr() handles