diff --git a/gnu/packages/audio.scm b/gnu/packages/audio.scm
index 9f928d57aa..0d07fd57a7 100644
--- a/gnu/packages/audio.scm
+++ b/gnu/packages/audio.scm
@@ -4452,9 +4452,10 @@ (define-public sox
     (build-system gnu-build-system)
     (arguments
      '(#:configure-flags
-       ;; The upstream asks to identify the distribution to diagnose SoX
-       ;; bug reports.
-       '("--with-distro=Guix System Distribution")))
+       '("CFLAGS=-g -O2 -Wno-error=implicit-function-declaration"
+         ;; Upstream asks to identify the distribution to diagnose SoX
+         ;; bug reports.
+         "--with-distro=Guix System Distribution")))
     (native-inputs
      (list pkg-config))
     (inputs