diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3139ef78..46ab1f93 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -73,7 +73,7 @@ if(MSVC)
         endforeach()
     endif()
 else()
-    add_compile_options(-Wextra -Wall)
+    add_compile_options(-Wextra -Wall $<$<COMPILE_LANGUAGE:C>:-Werror=implicit-function-declaration>)
 
     # Enable large file support on 32-bit systems.
     add_definitions(
diff --git a/deps/libMXF/CMakeLists.txt b/deps/libMXF/CMakeLists.txt
index 986af062..e2333067 100644
--- a/deps/libMXF/CMakeLists.txt
+++ b/deps/libMXF/CMakeLists.txt
@@ -74,7 +74,7 @@ if(MSVC)
         endforeach()
     endif()
 else()
-    add_compile_options(-Wextra -Wall)
+    add_compile_options(-Wextra -Wall $<$<COMPILE_LANGUAGE:C>:-Werror=implicit-function-declaration>)
 
     # Enable large file support on 32-bit systems.
     add_definitions(
diff --git a/deps/libMXFpp/CMakeLists.txt b/deps/libMXFpp/CMakeLists.txt
index a5e7b11a..7c3cf085 100644
--- a/deps/libMXFpp/CMakeLists.txt
+++ b/deps/libMXFpp/CMakeLists.txt
@@ -59,7 +59,7 @@ if(MSVC)
         endforeach()
     endif()
 else()
-    add_compile_options(-Wextra -Wall)
+    add_compile_options(-Wextra -Wall $<$<COMPILE_LANGUAGE:C>:-Werror=implicit-function-declaration>)
 
     # Enable large file support on 32-bit systems.
     add_definitions(