diff --git a/srcpkgs/OTPClient/patches/fix-cflags.patch b/srcpkgs/OTPClient/patches/fix-cflags.patch
new file mode 100644
index 00000000000..ae70f441538
--- /dev/null
+++ b/srcpkgs/OTPClient/patches/fix-cflags.patch
@@ -0,0 +1,17 @@
+Index: OTPClient-2.4.2/CMakeLists.txt
+===================================================================
+--- OTPClient-2.4.2.orig/CMakeLists.txt
++++ OTPClient-2.4.2/CMakeLists.txt
+@@ -11,11 +11,10 @@ option(BUILD_GUI "Build the GUI" ON)
+ option(BUILD_CLI "Build the CLI" ON)
+ 
+ set(CMAKE_C_STANDARD 11)
+-set(CMAKE_C_FLAGS "-Wall -Wextra -O3 -Wformat=2 -Wmissing-format-attribute -fstack-protector-strong -Wundef -Wmissing-format-attribute")
++set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wformat=2 -Wmissing-format-attribute -fstack-protector-strong -Wundef -Wmissing-format-attribute")
+ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fdiagnostics-color=always -Wstrict-prototypes -Wunreachable-code")
+ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wchar-subscripts -Wwrite-strings -Wpointer-arith -Wbad-function-cast -Wcast-align")
+ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror=format-security -Werror=implicit-function-declaration -Wno-sign-compare")
+-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3")
+ if(CMAKE_COMPILER_IS_GNUCC)
+     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pie -fPIE")
+ endif()
diff --git a/srcpkgs/OTPClient/template b/srcpkgs/OTPClient/template
index e8c0099850b..f5af76e655a 100644
--- a/srcpkgs/OTPClient/template
+++ b/srcpkgs/OTPClient/template
@@ -12,3 +12,4 @@ license="GPL-3.0-or-later"
 homepage="https://github.com/paolostivanin/OTPClient"
 distfiles="https://github.com/paolostivanin/OTPClient/archive/v${version}.tar.gz"
 checksum=74bc4312aa1cd336ca983434e3bed951c5ead327091e7708e3beb08508813495
+patch_args=-Np1