diff --git a/js/ctypes/tests/Makefile.in b/js/ctypes/tests/Makefile.in
--- a/js/ctypes/tests/Makefile.in
+++ b/js/ctypes/tests/Makefile.in
@@ -40,16 +40,17 @@ topsrcdir = @top_srcdir@
 topsrcdir = @top_srcdir@
 srcdir = @srcdir@
 VPATH = @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE = jsctypes-test
 LIBRARY_NAME = jsctypes-test
+SHORT_LIBNAME = jscttest
 FORCE_SHARED_LIB = 1
 NO_DIST_INSTALL = 1
 
 CPPSRCS = jsctypes-test.cpp
 
 EXTRA_DSO_LDOPTS += \
     $(XPCOM_STANDALONE_GLUE_LDOPTS) \
     $(NSPR_LIBS) \
diff --git a/js/ctypes/tests/unit/test_jsctypes.js.in b/js/ctypes/tests/unit/test_jsctypes.js.in
--- a/js/ctypes/tests/unit/test_jsctypes.js.in
+++ b/js/ctypes/tests/unit/test_jsctypes.js.in
@@ -330,14 +330,16 @@ function run_load_system_library()
 function run_load_system_library()
 {
 #ifdef XP_WIN
   var syslib = ctypes.open("user32.dll");
 #elifdef XP_MACOSX
   var syslib = ctypes.open("libm.dylib");
 #elifdef XP_UNIX
   var syslib = ctypes.open("libm.so");
+#elifdef XP_OS2
+  var syslib = ctypes.open("libc063.dll");
 #else
   // nothing run this test
 #endif
   syslib.close();
   return true;
 }