diff --git a/tests/build/build-opts.txt b/tests/build/build-opts.txt
index e99aa2bf..87683e3c 100644
--- a/tests/build/build-opts.txt
+++ b/tests/build/build-opts.txt
@@ -1,4 +1,5 @@
 CPPFLAGS=-DSEXP_USE_MODULES=0
+CPPFLAGS=-DSEXP_USE_GREEN_THREADS=0
 CPPFLAGS=-DSEXP_USE_DL=0
 CPPFLAGS=-DSEXP_USE_SIMPLIFY=0
 CPPFLAGS=-DSEXP_USE_TYPE_DEFS=0