diff --git a/source/slang/slang-emit-spirv.cpp b/source/slang/slang-emit-spirv.cpp
index 7a6d4aa38c..3b8e5e1d1b 100644
--- a/source/slang/slang-emit-spirv.cpp
+++ b/source/slang/slang-emit-spirv.cpp
@@ -91,7 +91,7 @@ enum class SpvLogicalSectionID
 };
 
 // The registered id for the Slang compiler.
-static const uint32_t kSPIRVSlangCompilerId = 40;
+static const uint32_t kSPIRVSlangCompilerId = 40 << 16;
 
 // While the SPIR-V module is nominally (according to the spec) just
 // a flat sequence of instructions, in practice some of the instructions