diff --git a/debian/patches/README b/debian/patches/README
deleted file mode 100644
index 80c1584..0000000
--- a/debian/patches/README
+++ /dev/null
@@ -1,3 +0,0 @@
-0xxx: Grabbed from upstream development.
-1xxx: Possibly relevant for upstream adoption.
-2xxx: Only relevant for official Debian release.
diff --git a/debian/patches/apply_CFLAGS.patch b/debian/patches/apply_CFLAGS.patch
new file mode 100644
index 0000000..1cfe8c5
--- /dev/null
+++ b/debian/patches/apply_CFLAGS.patch
@@ -0,0 +1,32 @@
+From: =?utf-8?q?IOhannes_m_zm=C3=B6lnig?= <umlaeute@debian.org>
+Date: Sat, 11 Jan 2025 19:01:54 +0100
+Subject: Make sure that CFLAGS from the cmdline are honoured
+
+Origin: Debian
+Forwarded: https://github.com/dyne/frei0r/pull/202
+Last-Update: 2025-01-11
+---
+ src/filter/levels/CMakeLists.txt              | 2 +-
+ src/filter/three_point_balance/CMakeLists.txt | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+--- frei0r.orig/src/filter/levels/CMakeLists.txt
++++ frei0r/src/filter/levels/CMakeLists.txt
+@@ -1,6 +1,6 @@
+ # Set C99 flag for gcc
+ if (CMAKE_COMPILER_IS_GNUCC)
+-    set(CMAKE_C_FLAGS "-std=c99")
++    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99")
+ endif (CMAKE_COMPILER_IS_GNUCC)
+ 
+ set (SOURCES levels.c)
+--- frei0r.orig/src/filter/three_point_balance/CMakeLists.txt
++++ frei0r/src/filter/three_point_balance/CMakeLists.txt
+@@ -1,6 +1,6 @@
+ # Set C99 flag for gcc
+ if (CMAKE_COMPILER_IS_GNUCC)
+-    set(CMAKE_C_FLAGS "-std=c99")
++    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99")
+ endif (CMAKE_COMPILER_IS_GNUCC)
+ 
+ set (SOURCES three_point_balance.c)
diff --git a/debian/patches/series b/debian/patches/series
index e69de29..99b688f 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -0,0 +1 @@
+apply_CFLAGS.patch