diff --git a/cmake.changes b/cmake.changes
index 31b4dda..9bdd281 100644
--- a/cmake.changes
+++ b/cmake.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Aug 16 17:44:46 UTC 2023 - Jan Engelhardt <jengelh@inai.de>
+
+- Make %cmake_build insert RELWITHDEBINFO CFLAGS as well to avoid
+  projects overriding our %optflags with some cmake default.
+
 -------------------------------------------------------------------
 Sat Aug 12 12:38:42 UTC 2023 - Christoph G <foss@grueninger.de>
 
diff --git a/cmake.macros b/cmake.macros
index 10cd1f7..3fb5f11 100644
--- a/cmake.macros
+++ b/cmake.macros
@@ -38,8 +38,11 @@
         -DSHARE_INSTALL_PREFIX:PATH=%{_datadir} \\\
         -DCMAKE_BUILD_TYPE=RelWithDebInfo \\\
         -DCMAKE_C_FLAGS="${CFLAGS:-%optflags}" \\\
+        -DCMAKE_C_FLAGS_RELWITHDEBINFO="${CFLAGS:-%optflags}" \\\
         -DCMAKE_CXX_FLAGS="${CXXFLAGS:-%optflags}" \\\
+        -DCMAKE_CXX_FLAGS_RELWITHDEBINFO="${CXXFLAGS:-%optflags}" \\\
         -DCMAKE_Fortran_FLAGS="${FFLAGS:-%optflags%{?_fmoddir: -I%_fmoddir}}" \\\
+        -DCMAKE_Fortran_FLAGS_RELWITHDEBINFO="${FFLAGS:-%optflags%{?_fmoddir: -I%_fmoddir}}" \\\
         -DCMAKE_EXE_LINKER_FLAGS="%{?build_ldflags} -Wl,--as-needed -Wl,-z,now" \\\
         -DCMAKE_MODULE_LINKER_FLAGS="%{?build_ldflags} -Wl,--as-needed" \\\
         -DCMAKE_SHARED_LINKER_FLAGS="%{?build_ldflags} -Wl,--as-needed -Wl,-z,now" \\\