diff --git a/adapters/opencv/kleidicv_hal.h b/adapters/opencv/kleidicv_hal.h
index dee7e9367d0f2d0be4ec66113060f3d6c3c09b94..9245de5c6a1a73abac703e7aec7cb3011f5a407b 100644
--- a/adapters/opencv/kleidicv_hal.h
+++ b/adapters/opencv/kleidicv_hal.h
@@ -174,8 +174,10 @@ int scharr_deriv(const uchar *src_data, size_t src_step, int16_t *dst_data,
 }  // namespace hal
 }  // namespace kleidicv
 
+#if KLEIDICV_USE_CV_NAMESPACE_IN_OPENCV_HAL
 // Other HAL implementations might require the cv namespace
 namespace cv {
+#endif  // KLEIDICV_USE_CV_NAMESPACE_IN_OPENCV_HAL
 
 // If the KleidiCV function has a signature matching the OpenCV HAL interface
 // AND it never returns KLEIDICV_NOT_IMPLEMENTED then we can call it directly
@@ -665,6 +667,8 @@ static inline int kleidicv_ScharrDeriv_with_fallback(const uchar *src_data,
 // Remove no longer needed macro definitions.
 #undef KLEIDICV_HAL_FALLBACK_FORWARD
 
+#if KLEIDICV_USE_CV_NAMESPACE_IN_OPENCV_HAL
 }  // namespace cv
+#endif  // KLEIDICV_USE_CV_NAMESPACE_IN_OPENCV_HAL
 
 #endif  // KLEIDICV_OPENCV_HAL_H
diff --git a/kleidicv/CMakeLists.txt b/kleidicv/CMakeLists.txt
index f48bb2a8832fcb91ab9b9275bf1c72599453d355..ff6a1cb47e77fc0eeb3a6e24936dda8e603eb082 100644
--- a/kleidicv/CMakeLists.txt
+++ b/kleidicv/CMakeLists.txt
@@ -39,6 +39,11 @@ option(
   "Limits SVE2 code paths to selected algorithms. Has no effect if KLEIDICV_ENABLE_SVE2 is false."
   ON
 )
+option(
+  KLEIDICV_USE_CV_NAMESPACE_IN_OPENCV_HAL
+  "Controls whether to use the cv namespace. Other OpenCV HAL implementations might require this, but it can cause issues as well."
+  ON
+)
 option(
   KLEIDICV_ENABLE_ALL_OPENCV_HAL
   "Internal - Enable all KleidiCV operations in the OpenCV HAL.
diff --git a/kleidicv/include/kleidicv/config.h.in b/kleidicv/include/kleidicv/config.h.in
index 39930f9b358e9d43288f9a8a61b067e186f4c894..2460c116e30587d307cb82279134b0575650ec44 100644
--- a/kleidicv/include/kleidicv/config.h.in
+++ b/kleidicv/include/kleidicv/config.h.in
@@ -13,6 +13,8 @@
 
 #cmakedefine01 KLEIDICV_ASSUME_128BIT_SVE2
 
+#cmakedefine01 KLEIDICV_USE_CV_NAMESPACE_IN_OPENCV_HAL
+
 #cmakedefine01 KLEIDICV_ENABLE_ALL_OPENCV_HAL
 
 #cmakedefine01 KLEIDICV_PREFER_INTERLEAVING_LOAD_STORE