diff --git a/pkgs/by-name/ap/apbs/package.nix b/pkgs/by-name/ap/apbs/package.nix
index 19137459d854..4a7a06f18292 100644
--- a/pkgs/by-name/ap/apbs/package.nix
+++ b/pkgs/by-name/ap/apbs/package.nix
@@ -27,6 +27,9 @@ let
       cmake
     ];
 
+    # Required for gcc-15 compatibility
+    env.NIX_CFLAGS_COMPILE = "-std=gnu17";
+
     cmakeFlags = [
       "-DBLAS_LIBRARIES=${blas}/lib"
       "-DBLA_STATIC=OFF"