diff --git a/configure.ac b/configure.ac
index a1aa904eec2e6e1a72ffced7a0e0940892b7ec4c..e078d7d00bb3bac1efe50d6d4b0b0e304dd7508b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -43,7 +43,7 @@ esac
 # Use C++ for testing headers
 AC_LANG([C++])
 
-AM_CXXFLAGS="-std=gnu++20 -Wall -Wno-dangling-else -Wextra -Wold-style-cast"
+AM_CXXFLAGS="-std=gnu++20 -Wall -Wno-dangling-else -Wextra -Wold-style-cast -Wno-unused-private-field"
 AC_SUBST([AM_CXXFLAGS])
 
 # If default 'ar' is not available, try to find one with a host prefix (see ticket #145)
diff --git a/src/Makefile.am b/src/Makefile.am
index 2a6fed484842c507d5bace3d982118c775fab7a4..a26e7a951e0ec041aecf3abd7bf00f3ebc4de4b5 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -66,7 +66,7 @@ EXTRA_DIST = \
 	$(BUILT_SOURCES)
 
 # The -I. is for <FlexLexer.h>
-dynare_preprocessor_CPPFLAGS = $(BOOST_CPPFLAGS) -I. -Wno-unused-private-field
+dynare_preprocessor_CPPFLAGS = $(BOOST_CPPFLAGS) -I.
 dynare_preprocessor_LDFLAGS = $(AM_LDFLAGS) $(BOOST_LDFLAGS)
 # -lpthread is no longer necessary for glibc ⩾ 2.34 (i.e. Debian “bookworm” 12)
 dynare_preprocessor_LDADD = macro/libmacro.a -lpthread