diff --git a/cpp/ql/src/semmle/code/cpp/models/implementations/Allocation.qll b/cpp/ql/src/semmle/code/cpp/models/implementations/Allocation.qll
index b3e903323cf..4f49d695378 100644
--- a/cpp/ql/src/semmle/code/cpp/models/implementations/Allocation.qll
+++ b/cpp/ql/src/semmle/code/cpp/models/implementations/Allocation.qll
@@ -77,6 +77,9 @@ class MallocAllocationFunction extends AllocationFunction {
         or
         // CoTaskMemAlloc(size)
         name = "CoTaskMemAlloc" and sizeArg = 0
+        or
+        // alloca(size)
+        name = "alloca" and sizeArg = 0
       )
     )
   }