diff --git a/src/tools/fs_shell/posix_compatibility.h b/src/tools/fs_shell/posix_compatibility.h
index d5693f0b60..07677ba88c 100644
--- a/src/tools/fs_shell/posix_compatibility.h
+++ b/src/tools/fs_shell/posix_compatibility.h
@@ -5,13 +5,19 @@
 #ifndef _FSSH_POSIX_COMPATIBILITY_H
 #define _FSSH_POSIX_COMPATIBILITY_H
 
-// BeOS doesn't define [U]LLONG_{MIN,MAX}, but [U]LONGLONG_{MIN,MAX}
 #include <limits.h>
-#ifndef LLONG_MIN
-#	define LLONG_MIN	LONGLONG_MIN
-#	define LLONG_MAX	LONGLONG_MAX
-#	define ULLONG_MAX	ULONGLONG_MAX
+
+// BeOS doesn't define [U]LLONG_{MIN,MAX}, but [U]LONGLONG_{MIN,MAX}.
+// And under some stupid Linux platforms we don't get the macros when
+// compiling in C++ mode.
+#ifndef LLONG_MAX
+#	ifdef LONGLONG_MAX
+		// define to the BeOS macro
+#		define LLONG_MAX	LONGLONG_MAX
+#	else
+		// minimum acceptable value as per standard
+#		define LLONG_MAX	(9223372036854775807LL)
+#	endif
 #endif
 
 #endif	// _FSSH_POSIX_COMPATIBILITY_H
-