diff --git a/src/tools/zip/Jamfile b/src/tools/zip/Jamfile
index 3ffd3aa3d5..6c9bcd6f0a 100644
--- a/src/tools/zip/Jamfile
+++ b/src/tools/zip/Jamfile
@@ -4,7 +4,9 @@ SEARCH_SOURCE += [ FDirName $(HAIKU_TOP) src bin zip ] ;
 
 USES_BE_API on <build>zip = true ;
 
-DEFINES += UNIX ;
+if ! $(HOST_PLATFORM_BEOS_COMPATIBLE) {
+	DEFINES += UNIX ;
+}
 
 BuildPlatformMain <build>zip :
 	beos.c