diff --git a/lib/system/gc.nim b/lib/system/gc.nim
index df7864cff4..0c632aeb12 100644
--- a/lib/system/gc.nim
+++ b/lib/system/gc.nim
@@ -17,7 +17,8 @@
 # stack overflows when traversing deep datastructures. It is well-suited
 # for soft real time applications (like games).
 
-import arch
+when defined(nimCoroutines):
+  import arch
 
 {.push profiler:off.}
 
diff --git a/lib/system/gc_ms.nim b/lib/system/gc_ms.nim
index 2973d1b9a7..d1aecb7a2a 100644
--- a/lib/system/gc_ms.nim
+++ b/lib/system/gc_ms.nim
@@ -10,7 +10,8 @@
 # A simple mark&sweep garbage collector for Nim. Define the
 # symbol ``gcUseBitvectors`` to generate a variant of this GC.
 
-import arch
+when defined(nimCoroutines):
+  import arch
 
 {.push profiler:off.}