diff --git a/configure.ac b/configure.ac
index 2e99babc1..8ce65388d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -677,7 +677,7 @@ AC_ARG_ENABLE([debug], AS_HELP_STRING([--enable-debug], [Build in debug mode, ad
 
 AS_IF([test "x$enable_debug" = "xyes"],
       [CXXFLAGS="${CXXFLAGS} -g -fno-omit-frame-pointer -Wall -Wextra -Wnon-virtual-dtor -Wno-unknown-pragmas -Wformat=2 -O0"],
-      [CXXFLAGS="${CXXFLAGS} -DNDEGUG=1"])
+      [CXXFLAGS="${CXXFLAGS} -DNDEBUG=1"])
 
 dnl What Makefiles to generate