diff --git a/core/main.mk b/core/main.mk
index 6f0277ec0e..d9c9732a85 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -122,6 +122,9 @@ ifeq (true,$(EMMA_INSTRUMENT))
 ifndef SKIP_BOOT_JARS_CHECK
 SKIP_BOOT_JARS_CHECK := true
 endif
+# Mainline modules prebuilts do support coverage. Build them from source.
+# See b/159241638
+MODULE_BUILD_FROM_SOURCE := true
 endif
 
 ifdef TARGET_ARCH_SUITE