diff --git a/cpp/ql/src/semmle/code/cpp/ir/internal/ASTValueNumbering.qll b/cpp/ql/src/semmle/code/cpp/ir/internal/ASTValueNumbering.qll
index 2bb8315990a..90e9b4ef920 100644
--- a/cpp/ql/src/semmle/code/cpp/ir/internal/ASTValueNumbering.qll
+++ b/cpp/ql/src/semmle/code/cpp/ir/internal/ASTValueNumbering.qll
@@ -51,6 +51,7 @@ private import semmle.code.cpp.ir.IR
  * methods.
  */
 class GVN extends TValueNumber {
+  pragma[noinline]
   GVN() {
     exists(Instruction instr |
       this = tvalueNumber(instr) and exists(instr.getUnconvertedResultExpression())