diff --git a/docker/packager/packager b/docker/packager/packager
index 4c443896f4a..2e2b6550636 100755
--- a/docker/packager/packager
+++ b/docker/packager/packager
@@ -289,7 +289,7 @@ def parse_env_variables(
         result.append("BUILD_TYPE=None")
 
     if coverage:
-        result.append("SANITIZE_COVERAGE=1")
+        cmake_flags.append("-DSANITIZE_COVERAGE=1")
 
     if not cache:
         cmake_flags.append("-DCOMPILER_CACHE=disabled")