diff --git a/src/core/Evaluate.go b/src/core/Evaluate.go
index f7eef07..216e480 100644
--- a/src/core/Evaluate.go
+++ b/src/core/Evaluate.go
@@ -145,12 +145,11 @@ func (f *Function) Evaluate(expr *expression.Expression) (ssa.Value, error) {
 				}
 			}
 
-			call := &ssa.Call{
-				Arguments: args,
-				Source:    ssa.Source(expr.Source),
+			if fn.IsExtern() {
+				return f.Append(&ssa.CallExtern{Arguments: args, Source: ssa.Source(expr.Source)}), nil
 			}
 
-			return f.Append(call), nil
+			return f.Append(&ssa.Call{Arguments: args, Source: ssa.Source(expr.Source)}), nil
 		}
 
 	case token.Dot:
diff --git a/src/ssa/CallExtern.go b/src/ssa/CallExtern.go
new file mode 100644
index 0000000..a6b4b68
--- /dev/null
+++ b/src/ssa/CallExtern.go
@@ -0,0 +1,73 @@
+package ssa
+
+import (
+	"strconv"
+	"strings"
+
+	"git.urbach.dev/cli/q/src/types"
+)
+
+type CallExtern struct {
+	Id
+	Arguments
+	Liveness
+	Source
+}
+
+func (a *CallExtern) Equals(v Value) bool {
+	b, sameType := v.(*CallExtern)
+
+	if !sameType {
+		return false
+	}
+
+	return a.Arguments.Equals(b.Arguments)
+}
+
+func (v *CallExtern) IsConst() bool {
+	return false
+}
+
+func (v *CallExtern) Debug(expand bool) string {
+	tmp := strings.Builder{}
+
+	if expand {
+		tmp.WriteString(v.Arguments[0].String())
+	} else {
+		tmp.WriteString("%")
+		tmp.WriteString(strconv.Itoa(v.Arguments[0].ID()))
+	}
+
+	tmp.WriteString("(")
+	args := v.Arguments[1:]
+
+	for i, arg := range args {
+		if expand {
+			tmp.WriteString(arg.String())
+		} else {
+			tmp.WriteString("%")
+			tmp.WriteString(strconv.Itoa(arg.ID()))
+		}
+
+		if i != len(args)-1 {
+			tmp.WriteString(", ")
+		}
+	}
+
+	tmp.WriteString(")")
+	return tmp.String()
+}
+
+func (v *CallExtern) String() string {
+	return v.Debug(true)
+}
+
+func (v *CallExtern) Type() types.Type {
+	typ := v.Arguments[0].(*Function).Typ
+
+	if len(typ.Output) == 0 {
+		return types.Void
+	}
+
+	return typ.Output[0]
+}
\ No newline at end of file
diff --git a/src/ssa2asm/GenerateAssembly.go b/src/ssa2asm/GenerateAssembly.go
index e36f902..1781ccf 100644
--- a/src/ssa2asm/GenerateAssembly.go
+++ b/src/ssa2asm/GenerateAssembly.go
@@ -21,7 +21,7 @@ func (f *Compiler) GenerateAssembly(ir ssa.IR, isLeaf bool) {
 		}
 
 		switch instr := instr.(type) {
-		case *ssa.Call, *ssa.Syscall:
+		case *ssa.Call, *ssa.CallExtern, *ssa.Syscall:
 			f.ValueToRegister(instr, f.CPU.Return[0])
 
 		case *ssa.Return:
diff --git a/src/ssa2asm/ValueToRegister.go b/src/ssa2asm/ValueToRegister.go
index 10b1bfb..81e2d05 100644
--- a/src/ssa2asm/ValueToRegister.go
+++ b/src/ssa2asm/ValueToRegister.go
@@ -25,35 +25,45 @@ func (f *Compiler) ValueToRegister(instr ssa.Value, destination cpu.Register) {
 	case *ssa.Call:
 		fn := instr.Arguments[0].(*ssa.Function)
 		args := instr.Arguments[1:]
+		offset := 0
 
-		if fn.IsExtern {
-			for i := range slices.Backward(args) {
-				f.ValueToRegister(args[i], f.CPU.ExternCall[i])
-			}
+		for i := range slices.Backward(args) {
+			structure, isStruct := args[i].(*ssa.Struct)
 
-			dot := strings.IndexByte(fn.UniqueName, '.')
-			library := fn.UniqueName[:dot]
-			function := fn.UniqueName[dot+1:]
-			f.Assembler.Append(&asm.CallExtern{Library: library, Function: function})
-		} else {
-			offset := 0
-
-			for i := range slices.Backward(args) {
-				structure, isStruct := args[i].(*ssa.Struct)
-
-				if isStruct {
-					for _, field := range structure.Arguments {
-						f.ValueToRegister(field, f.CPU.Call[offset+i])
-						i++
-					}
-				} else {
-					f.ValueToRegister(args[i], f.CPU.Call[offset+i])
+			if isStruct {
+				for _, field := range structure.Arguments {
+					f.ValueToRegister(field, f.CPU.Call[offset+i])
+					i++
 				}
+			} else {
+				f.ValueToRegister(args[i], f.CPU.Call[offset+i])
 			}
-
-			f.Assembler.Append(&asm.Call{Label: fn.UniqueName})
 		}
 
+		f.Assembler.Append(&asm.Call{Label: fn.UniqueName})
+
+		if destination == f.CPU.Return[0] {
+			return
+		}
+
+		f.Assembler.Append(&asm.MoveRegisterRegister{
+			Destination: destination,
+			Source:      f.CPU.Return[0],
+		})
+
+	case *ssa.CallExtern:
+		fn := instr.Arguments[0].(*ssa.Function)
+		args := instr.Arguments[1:]
+
+		for i := range slices.Backward(args) {
+			f.ValueToRegister(args[i], f.CPU.ExternCall[i])
+		}
+
+		dot := strings.IndexByte(fn.UniqueName, '.')
+		library := fn.UniqueName[:dot]
+		function := fn.UniqueName[dot+1:]
+		f.Assembler.Append(&asm.CallExtern{Library: library, Function: function})
+
 		if destination == f.CPU.Return[0] {
 			return
 		}