diff --git a/cmake/EthCompilerSettings.cmake b/cmake/EthCompilerSettings.cmake
index 51824974a..4d3dfb418 100644
--- a/cmake/EthCompilerSettings.cmake
+++ b/cmake/EthCompilerSettings.cmake
@@ -54,6 +54,12 @@ if (("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" MA
 			# Set stack size to 32MB - by default Apple's clang defines a stack size of 8MB.
 			# Normally 16MB is enough to run all tests, but it will exceed the stack, if -DSANITIZE=address is used.
 			set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-stack_size -Wl,0x2000000")
+
+			# Boost libraries use visibility=hidden to reduce unnecessary DWARF entries.
+			# Unless we match visibility, ld will give a warning message like:
+			#   ld: warning: direct access in function 'boost::filesystem... from file ...
+			#   means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings.
+			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden")
 		endif()
 
 		# Some Linux-specific Clang settings.  We don't want these for OS X.