diff --git a/javascript/resources/tools/autobuild.cmd b/javascript/resources/tools/autobuild.cmd
index c64898bea781..72feddeab124 100644
--- a/javascript/resources/tools/autobuild.cmd
+++ b/javascript/resources/tools/autobuild.cmd
@@ -6,7 +6,7 @@ set jvm_args=-Xss16m
 rem If CODEQL_RAM is set, use half for Java and half for TS.
 if NOT [%CODEQL_RAM%] == [] (
     set /a "half_ram=CODEQL_RAM/2"
-    set LGTM_TYPESCRIPT_RAM=%half_ram%
+    set LGTM_TYPESCRIPT_RAM=!half_ram!
     set jvm_args=!jvm_args! -Xmx!half_ram!m
 )