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-rw-r--r--tests/stdlib/concurrency/tatomics.nim4
-rw-r--r--tests/stdlib/concurrency/tatomics_size.nim5
2 files changed, 6 insertions, 3 deletions
diff --git a/tests/stdlib/concurrency/tatomics.nim b/tests/stdlib/concurrency/tatomics.nim
index 3fb5197da..08f2e7d3e 100644
--- a/tests/stdlib/concurrency/tatomics.nim
+++ b/tests/stdlib/concurrency/tatomics.nim
@@ -1,5 +1,7 @@
 discard """
-  matrix: "--mm:refc; --mm:orc"
+  # test C with -d:nimUseCppAtomics as well to check nothing breaks
+  matrix: "--mm:refc; --mm:orc; --mm:refc -d:nimUseCppAtomics; --mm:orc -d:nimUseCppAtomics"
+  targets: "c cpp"
 """
 
 # test atomic operations
diff --git a/tests/stdlib/concurrency/tatomics_size.nim b/tests/stdlib/concurrency/tatomics_size.nim
index cfe568623..f64adb308 100644
--- a/tests/stdlib/concurrency/tatomics_size.nim
+++ b/tests/stdlib/concurrency/tatomics_size.nim
@@ -1,5 +1,6 @@
 discard """
-  matrix: "--mm:refc; --mm:orc"
+  # test C with -d:nimUseCppAtomics as well to check nothing breaks
+  matrix: "--mm:refc; --mm:orc; --mm:refc -d:nimUseCppAtomics; --mm:orc -d:nimUseCppAtomics"
   targets: "c cpp"
 """
 import std/atomics
@@ -17,4 +18,4 @@ block testSize: # issue 12726
       f: AtomicFlag
   static:
     doAssert sizeof(Node) == sizeof(pointer)
-    doAssert sizeof(MyChannel) == sizeof(pointer) * 2
\ No newline at end of file
+    doAssert sizeof(MyChannel) == sizeof(pointer) * 2