diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index d622662b1..88f0f8a07 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -777,6 +777,15 @@ endif ((NOT LIBDSDCC_FOUND OR LIBDSDCC_EXTERNAL) AND LIBMBE_FOUND)
 
 if ((LINUX OR APPLE) AND (NOT LIBSIGMF_FOUND OR LIBSIGMF_EXTERNAL))
     set(LIBSIGMF_LIBRARIES "${EXTERNAL_BUILD_LIBRARIES}/lib${LIB_SUFFIX}/liblibsigmf${CMAKE_SHARED_LIBRARY_SUFFIX}" CACHE INTERNAL "")
+    if(APPLE)
+        set(LIBSIGMF_PATCH_COMMAND
+            sed -i "" -e "s/-Werror//g" -e "s/VERSION 2.8/VERSION 3.10/g" <SOURCE_DIR>/external/flatbuffers/CMakeLists.txt
+        )
+    else()
+        set(LIBSIGMF_PATCH_COMMAND
+            sed -i -e "s/-Werror//g" -e "s/VERSION 2.8/VERSION 3.10/g" <SOURCE_DIR>/external/flatbuffers/CMakeLists.txt
+        )
+    endif()
     ExternalProject_Add(libsigmf
             GIT_REPOSITORY https://github.com/f4exb/libsigmf.git
             GIT_TAG ${LIBSIGMF_TAG}
@@ -784,7 +793,7 @@ if ((LINUX OR APPLE) AND (NOT LIBSIGMF_FOUND OR LIBSIGMF_EXTERNAL))
             INSTALL_DIR "${EXTERNAL_BUILD_LIBRARIES}"
             CMAKE_ARGS ${COMMON_CMAKE_ARGS} -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
             UPDATE_DISCONNECTED TRUE
-            PATCH_COMMAND sed -i "" -e "s/-Werror//g" -e "s/VERSION 2.8/VERSION 3.10/g" <SOURCE_DIR>/external/flatbuffers/CMakeLists.txt
+            PATCH_COMMAND  ${LIBSIGMF_PATCH_COMMAND}
             BUILD_BYPRODUCTS "${LIBSIGMF_LIBRARIES}"
             TEST_COMMAND ""
             )