diff --git a/CHANGES.txt b/CHANGES.txt
index e6d6a63e9..6f0f328a3 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,11 @@
+0.10.0 (2015-??-??)
+===================
+
+Features
+--------
+
+* Allow multiple sandbox module directories to be specified (#1525).
+
 0.10.0b0 (2015-07-13)
 =====================
 
diff --git a/sandbox/lua/lua_sandbox.go.in b/sandbox/lua/lua_sandbox.go.in
index 0afc4979b..b900a7e4b 100644
--- a/sandbox/lua/lua_sandbox.go.in
+++ b/sandbox/lua/lua_sandbox.go.in
@@ -50,6 +50,19 @@ remove_entries = {
 [''] = { 'dofile', 'load', 'loadfile','loadstring', 'print'},
 os = {'exit', 'setlocale'}}}`
 
+const SandboxTemplate = `{
+memory_limit = %d,
+instruction_limit = %d,
+output_limit = %d,
+path = [[%s]],
+cpath = [[%s]],
+remove_entries = {
+[''] = {'collectgarbage','coroutine','dofile','load','loadfile','loadstring','newproxy','print'},
+os = {'getenv','execute','exit','remove','rename','setlocale','tmpname'}
+},
+disable_modules = {io = 1}
+}`
+
 func extractLuaFieldName(wrapped string) (fn string, found bool) {
 	if l := len(wrapped); l > 0 && wrapped[l-1] == ']' {
 		if strings.HasPrefix(wrapped, "Fields[") {
@@ -647,31 +660,38 @@ type LuaSandbox struct {
 }
 
 func CreateLuaSandbox(conf *sandbox.SandboxConfig) (sandbox.Sandbox, error) {
+	var (
+		lua_path, lua_cpath []string
+		template            string
+	)
 	lsb := new(LuaSandbox)
 	lsb.sbConfig = conf
 	cs := C.CString(conf.ScriptFilename)
 	defer C.free(unsafe.Pointer(cs))
+
+	paths := strings.Split(conf.ModuleDirectory, ";")
+	for _, p := range paths {
+		lua_path = append(lua_path, filepath.Join(p, "?.lua"))
+		lua_cpath = append(lua_cpath, filepath.Join(p, "?@LUA_SHARED_LIBRARY_SUFFIX@"))
+	}
+
 	if conf.PluginType == "output" || conf.PluginType == "input" {
-		cfg := fmt.Sprintf(SandboxIoTemplate,
-			conf.MemoryLimit,
-			conf.InstructionLimit,
-			conf.OutputLimit,
-			filepath.Join(conf.ModuleDirectory, "?.lua"),
-			filepath.Join(conf.ModuleDirectory, "?@LUA_SHARED_LIBRARY_SUFFIX@"))
-		ccfg := C.CString(cfg)
-		defer C.free(unsafe.Pointer(ccfg))
-		lsb.lsb = C.lsb_create_custom(unsafe.Pointer(lsb), cs, ccfg)
+		template = SandboxIoTemplate
 	} else {
-		md := C.CString(conf.ModuleDirectory)
-		defer C.free(unsafe.Pointer(md))
-		lsb.lsb = C.lsb_create(unsafe.Pointer(lsb),
-			cs,
-			md,
-			C.uint(conf.MemoryLimit),
-			C.uint(conf.InstructionLimit),
-			C.uint(conf.OutputLimit))
+		template = SandboxTemplate
 	}
 
+	cfg := fmt.Sprintf(template,
+		conf.MemoryLimit,
+		conf.InstructionLimit,
+		conf.OutputLimit,
+		strings.Join(lua_path, ";"),
+		strings.Join(lua_cpath, ";"))
+	ccfg := C.CString(cfg)
+	defer C.free(unsafe.Pointer(ccfg))
+
+	lsb.lsb = C.lsb_create_custom(unsafe.Pointer(lsb), cs, ccfg)
+
 	if lsb.lsb == nil {
 		return nil, fmt.Errorf("Sandbox creation failed")
 	}
diff --git a/sandbox/lua/lua_sandbox_test.go b/sandbox/lua/lua_sandbox_test.go
index 3e967b409..2d423575d 100644
--- a/sandbox/lua/lua_sandbox_test.go
+++ b/sandbox/lua/lua_sandbox_test.go
@@ -295,7 +295,7 @@ func TestAPIErrors(t *testing.T) {
 		"invalid error message",
 	}
 	msgs := []string{
-		"process_message() ./testsupport/errors.lua:11: module 'unknown' not found:\n\tno file '/unknown.lua'\n\tno file '/unknown.so'",
+		"process_message() ./testsupport/errors.lua:11: module 'unknown' not found:\n\tno file 'unknown.lua'\n\tno file 'unknown.so'",
 		"process_message() ./testsupport/errors.lua:13: bad argument #0 to 'add_to_payload' (must have at least one argument)",
 		"process_message() not enough memory",
 		"process_message() instruction_limit exceeded",
diff --git a/sandbox/lua/testsupport/modules/dummy.lua b/sandbox/lua/testsupport/modules/dummy.lua
new file mode 100644
index 000000000..5328836c3
--- /dev/null
+++ b/sandbox/lua/testsupport/modules/dummy.lua
@@ -0,0 +1,6 @@
+local M = {}
+setfenv(1, M) -- Remove external access to contain everything in the module.
+
+version = "1.0.0"
+
+return M
diff --git a/sandbox/lua/testsupport/output.lua b/sandbox/lua/testsupport/output.lua
index d1fe5534f..02d188b00 100644
--- a/sandbox/lua/testsupport/output.lua
+++ b/sandbox/lua/testsupport/output.lua
@@ -1,5 +1,6 @@
 require "io"
 require "string"
+require "dummy"
 
 function process_message()
     local payload = read_message("Payload")
diff --git a/sandbox/plugins/sandbox_manager_filter.go b/sandbox/plugins/sandbox_manager_filter.go
index bd2b5900b..3cc0023c2 100644
--- a/sandbox/plugins/sandbox_manager_filter.go
+++ b/sandbox/plugins/sandbox_manager_filter.go
@@ -100,7 +100,7 @@ func (this *SandboxManagerFilter) Init(config interface{}) (err error) {
 	globals := this.pConfig.Globals
 	this.maxFilters = conf.MaxFilters
 	this.workingDirectory = globals.PrependBaseDir(conf.WorkingDirectory)
-	this.moduleDirectory = globals.PrependShareDir(conf.ModuleDirectory)
+	this.moduleDirectory = conf.ModuleDirectory
 	this.memoryLimit = conf.MemoryLimit
 	this.instructionLimit = conf.InstructionLimit
 	this.outputLimit = conf.OutputLimit
diff --git a/sandbox/plugins/sandbox_output_test.go b/sandbox/plugins/sandbox_output_test.go
index fd619ef14..8e48b69a3 100644
--- a/sandbox/plugins/sandbox_output_test.go
+++ b/sandbox/plugins/sandbox_output_test.go
@@ -43,7 +43,7 @@ func OutputSpec(c gs.Context) {
 		output.SetPipelineConfig(pConfig)
 		conf := output.ConfigStruct().(*sandbox.SandboxConfig)
 		conf.ScriptFilename = "../lua/testsupport/output.lua"
-		conf.ModuleDirectory = "../lua/modules"
+		conf.ModuleDirectory = "../lua/modules;../lua/testsupport/modules"
 		supply := make(chan *pipeline.PipelinePack, 1)
 		pack := pipeline.NewPipelinePack(supply)
 		data := "1376389920 debug id=2321 url=example.com item=1"