diff --git a/cmd/fsplc/main.go b/cmd/fsplc/main.go
index 700e83a..e91ddfb 100644
--- a/cmd/fsplc/main.go
+++ b/cmd/fsplc/main.go
@@ -47,6 +47,13 @@ func main () {
 		'O', "optimization",
 		"Optimization level (0-3)", "0",
 		cli.NewValSet("0", "1", "2", "3"))
+	includePath := cli.NewInputFlag (
+		'u', "unit-directory",
+		"Extra directory(s) to search for units in", "",
+		cli.ValString)
+	includePath.Found = func (application *cli.Cli, value string) {
+		comp.Resolver.AddPathFront(value)
+	}
 
 	application := cli.New (
 		"Compile FSPL source files",
@@ -55,7 +62,8 @@ func main () {
 		quiet,
 		filetype,
 		output,
-		optimization)
+		optimization,
+		includePath)
 	
 	application.Syntax = "[OPTION]... ADDRESS"
 	application.ParseOrExit(os.Args)
diff --git a/compiler/resolver.go b/compiler/resolver.go
index 39f313a..4dfb0c0 100644
--- a/compiler/resolver.go
+++ b/compiler/resolver.go
@@ -48,7 +48,7 @@ func (resolver *Resolver) AddPathFront (path ...string) {
 //   - If the address starts with '/', it is treated as an absolute path from
 //     the fs root
 //   - Else, the address is searched for in the resolver's paths
-func (resolver Resolver) Resolve (context string, address entity.Address) (string, error) {
+func (resolver *Resolver) Resolve (context string, address entity.Address) (string, error) {
 	strAddr := string(address)
 	switch {
 	case strings.HasPrefix(strAddr, "."):
@@ -71,7 +71,7 @@ func (resolver Resolver) Resolve (context string, address entity.Address) (strin
 	}
 }
 
-func (resolver Resolver) search (needle string) (string, error) {
+func (resolver *Resolver) search (needle string) (string, error) {
 	for _, dirPath := range resolver.Path {
 		// attempt to open the file as dir.
 		// if we can't open the dir, just skip it, because it is
@@ -98,7 +98,7 @@ func (resolver Resolver) search (needle string) (string, error) {
 
 // ResolveCwd resolves the address within the context of the current working
 // directory.
-func (resolver Resolver) ResolveCwd (address entity.Address) (string, error) {
+func (resolver *Resolver) ResolveCwd (address entity.Address) (string, error) {
 	wd, err := os.Getwd()
 	if err != nil { return "", err }
 	return resolver.Resolve(wd, address)