diff -rauN a/config/makefiles/rust.mk b/config/makefiles/rust.mk
--- a/config/makefiles/rust.mk	2019-09-21 12:17:00.399732877 +0200
+++ b/config/makefiles/rust.mk	2019-09-21 12:18:04.531378287 +0200
@@ -244,6 +244,7 @@
 # When we are building in --enable-release mode; we add an additional check to confirm
 # that we are not importing any networking-related functions in rust code. This reduces
 # the chance of proxy bypasses originating from rust code.
+ifndef MOZ_PROFILE_GENERATE
 ifndef DEVELOPER_OPTIONS
 ifndef MOZ_DEBUG_RUST
 ifeq ($(OS_ARCH), Linux)
@@ -251,6 +252,7 @@
 endif
 endif
 endif
+endif
 
 force-cargo-library-check:
 	$(call CARGO_CHECK) --lib $(cargo_target_flag) $(rust_features_flag)