diff --git a/CI/conan/macos-arm b/CI/conan/macos-arm
index 4e58922ba..99858c9b3 100644
--- a/CI/conan/macos-arm
+++ b/CI/conan/macos-arm
@@ -9,3 +9,5 @@ build_type=Release
 [options]
 [build_requires]
 [env]
+[conf]
+tools.cmake.cmaketoolchain:generator = Ninja
diff --git a/CI/conan/macos-intel b/CI/conan/macos-intel
index f1717b4aa..510caaee4 100644
--- a/CI/conan/macos-intel
+++ b/CI/conan/macos-intel
@@ -9,3 +9,5 @@ build_type=Release
 [options]
 [build_requires]
 [env]
+[conf]
+tools.cmake.cmaketoolchain:generator = Ninja