diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -286,6 +286,7 @@
   ## unknown options if any other warning is produced. Test the -Wfoo case, and
   ## set the -Wno-foo case if it works.
   AX_CHECK_COMPILE_FLAG([-Wunused-parameter],[CXXFLAGS="$CXXFLAGS -Wno-unused-parameter"],,[[$CXXFLAG_WERROR]])
+  AX_CHECK_COMPILE_FLAG([-Wimplicit-fallthrough],[CXXFLAGS="$CXXFLAGS -Wno-implicit-fallthrough"],,[[$CXXFLAG_WERROR]])
 fi
 
 # Check for optional instruction set support. Enabling these does _not_ imply that all code will
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -89,6 +89,7 @@
 	-Wformat
 	-Wvla
 	-Wformat-security
+	-Wimplicit-fallthrough
 	-Wcast-align
 	-Wunused-parameter
 	-Wmissing-braces
@@ -102,6 +103,7 @@
 	add_cxx_compiler_flag(-Wsuggest-override)
 else()
 	add_compiler_flag(-Wno-unused-parameter)
+	add_compiler_flag(-Wno-implicit-fallthrough)
 endif()
 
 # Create a target for OpenSSL