diff --git a/src/ir.cpp b/src/ir.cpp
index a35c6380a7e55a07498ffb3b9bb3201525e0fef4..7e98e99af10629aa134fb3657e0b60130f1e121e 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -19229,6 +19229,11 @@ static ZigType *ir_analyze_instruction_slice(IrAnalyze *ira, IrInstructionSlice
                 return ira->codegen->builtin_types.entry_invalid;
 
             parent_ptr = &slice_ptr->data.x_struct.fields[slice_ptr_index];
+            if (parent_ptr->special == ConstValSpecialUndef) {
+                ir_add_error(ira, &instruction->base, buf_sprintf("slice of undefined"));
+                return ira->codegen->builtin_types.entry_invalid;
+            }
+
             ConstExprValue *len_val = &slice_ptr->data.x_struct.fields[slice_len_index];
 
             switch (parent_ptr->data.x_ptr.special) {
diff --git a/test/compile_errors.zig b/test/compile_errors.zig
index c1e25c1df9a96a52a2d7368cc74cdfc88859d5b8..62df9f077d42da91425c3329ca744af3b1dba3ab 100644
--- a/test/compile_errors.zig
+++ b/test/compile_errors.zig
@@ -1,6 +1,16 @@
 const tests = @import("tests.zig");
 
 pub fn addCases(cases: *tests.CompileErrorContext) void {
+    cases.add(
+        "comptime slice of an undefined slice",
+        \\comptime {
+        \\    var a: []u8 = undefined;
+        \\    var b = a[0..10];
+        \\}
+    ,
+        ".tmp_source.zig:3:14: error: slice of undefined",
+    );
+
     cases.add(
         "implicit cast const array to mutable slice",
         \\export fn entry() void {