diff --git a/src/glsl/ir_function_can_inline.cpp b/src/glsl/ir_function_can_inline.cpp
index f29f277ef4b..c367c30e44f 100644
--- a/src/glsl/ir_function_can_inline.cpp
+++ b/src/glsl/ir_function_can_inline.cpp
@@ -60,6 +60,8 @@ can_inline(ir_call *call)
 {
    ir_function_can_inline_visitor v;
    const ir_function_signature *callee = call->get_callee();
+   if (!callee->is_defined)
+      return false;
 
    v.run((exec_list *) &callee->body);