diff --git a/CMakeLists.txt b/CMakeLists.txt
index 708f8a1b..53ec8c5f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -163,7 +163,7 @@ if (CMAKE_COMPILER_IS_GNUCC)
     option(EVENT__ENABLE_GCC_FUNCTION_SECTIONS "Enable gcc function sections" OFF)
     option(EVENT__ENABLE_GCC_WARNINGS "Make all GCC warnings into errors" OFF)
 
-        list(APPEND __FLAGS -Wall)
+        list(APPEND __FLAGS -Wall -Wswitch)
 
     if (EVENT__DISABLE_GCC_WARNINGS)
             list(APPEND __FLAGS -w)
diff --git a/configure.ac b/configure.ac
index 6a669fb7..52710b54 100644
--- a/configure.ac
+++ b/configure.ac
@@ -792,7 +792,7 @@ if test x$enable_gcc_warnings != xno && test "$GCC" = "yes"; then
 #error
 #endif])], have_clang=yes, have_clang=no)
 
-  CFLAGS="$CFLAGS -W -Wfloat-equal -Wundef -Wpointer-arith -Wstrict-prototypes -Wmissing-prototypes -Wwrite-strings -Wredundant-decls -Wchar-subscripts -Wcomment -Wformat -Wwrite-strings -Wmissing-declarations -Wredundant-decls -Wnested-externs -Wbad-function-cast -Wswitch-enum"
+  CFLAGS="$CFLAGS -W -Wfloat-equal -Wundef -Wpointer-arith -Wstrict-prototypes -Wmissing-prototypes -Wwrite-strings -Wredundant-decls -Wchar-subscripts -Wcomment -Wformat -Wwrite-strings -Wmissing-declarations -Wredundant-decls -Wnested-externs -Wbad-function-cast -Wswitch"
   if test x$enable_gcc_warnings = xyes; then
     CFLAGS="$CFLAGS -Werror"
   fi