diff --git a/configure.ac b/configure.ac
index e60af602..4fb7e831 100644
--- a/configure.ac
+++ b/configure.ac
@@ -95,7 +95,7 @@ AC_ARG_ENABLE([gcc-warnings],
 AM_CONDITIONAL([ENABLE_GCC_WARNINGS], [test "$enable_gcc_warnings" = yes])
 if test "$enable_gcc_warnings" = yes; then
   warn_common='-Wall -Wextra -Wno-sign-compare -Wcast-align
-    -fparse-all-comments -Wdocumentation
+    -fparse-all-comments -Wdocumentation -Wextra-semi
     -Wformat -Wnull-dereference -Wpointer-arith -Wshadow -Wwrite-strings'
   warn_c='-Wbad-function-cast -Wstrict-prototypes'
   warn_cxx='-Wextra-semi -Wnoexcept'