diff --git a/compiler/src/dmd/hdrgen.d b/compiler/src/dmd/hdrgen.d
index a44fb2877a95..f3c6bbb56b63 100644
--- a/compiler/src/dmd/hdrgen.d
+++ b/compiler/src/dmd/hdrgen.d
@@ -1858,9 +1858,9 @@ void toCBuffer(Dsymbol s, ref OutBuffer buf, ref HdrGenState hgs)
         if (stcToBuffer(buf, d.storage_class))
             buf.writeByte(' ');
         buf.writestring("invariant");
-        if(auto es = d.fbody.isExpStatement())
+        auto es = d.fbody.isExpStatement();
+        if (es && es.exp && es.exp.op == EXP.assert_)
         {
-            assert(es.exp && es.exp.op == EXP.assert_);
             buf.writestring(" (");
             (cast(AssertExp)es.exp).e1.expressionToBuffer(buf, hgs);
             buf.writestring(");");
diff --git a/compiler/test/compilable/extra-files/vcg-ast.d.cg b/compiler/test/compilable/extra-files/vcg-ast.d.cg
index 640cba43ed67..e6a9ca384f22 100644
--- a/compiler/test/compilable/extra-files/vcg-ast.d.cg
+++ b/compiler/test/compilable/extra-files/vcg-ast.d.cg
@@ -100,6 +100,12 @@ void main()
 	values();
 	return 0;
 }
+import imports.vcg_ast_import;
+template imported()
+{
+	import imported = imports.vcg_ast_import;
+}
+alias myImport = vcg_ast_import;
 R!int
 {
 	struct _R
@@ -126,6 +132,21 @@ mixin _d_cmain!();
 		}
 	}
 }
+imported!()
+{
+	import object;
+	struct O
+	{
+		invariant
+		{
+		}
+		invariant
+		{
+			__invariant0();
+		}
+	}
+
+}
 RTInfo!(C)
 {
 	enum immutable(void)* RTInfo = null;
@@ -150,4 +171,3 @@ RTInfo!(_R)
 	enum immutable(void)* RTInfo = null;
 
 }
-
diff --git a/compiler/test/compilable/imports/vcg_ast_import.d b/compiler/test/compilable/imports/vcg_ast_import.d
new file mode 100644
index 000000000000..a2064c0d175b
--- /dev/null
+++ b/compiler/test/compilable/imports/vcg_ast_import.d
@@ -0,0 +1,4 @@
+struct O
+{
+    invariant() {}
+}
diff --git a/compiler/test/compilable/vcg-ast.d b/compiler/test/compilable/vcg-ast.d
index 4a7b8bc33c48..9197441affea 100644
--- a/compiler/test/compilable/vcg-ast.d
+++ b/compiler/test/compilable/vcg-ast.d
@@ -2,6 +2,7 @@
 REQUIRED_ARGS: -vcg-ast -o-
 PERMUTE_ARGS:
 OUTPUT_FILES: compilable/vcg-ast.d.cg
+EXTRA_FILES: imports/vcg_ast_import.d
 TEST_OUTPUT_FILE: extra-files/vcg-ast.d.cg
 */
 
@@ -63,3 +64,14 @@ void main()
 {
     values!wchar_t;
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=24764
+
+import imports.vcg_ast_import;
+
+template imported()
+{
+    import imported = imports.vcg_ast_import;
+}
+
+alias myImport = imported!();