diff --git a/pkgs/development/compilers/scryer-prolog/cargo.patch b/pkgs/development/compilers/scryer-prolog/cargo.patch
deleted file mode 100644
index 48db924ca261..000000000000
--- a/pkgs/development/compilers/scryer-prolog/cargo.patch
+++ /dev/null
@@ -1,24 +0,0 @@
-diff --git a/Cargo.lock b/Cargo.lock
-index 05e54911..3a567165 100644
---- a/Cargo.lock
-+++ b/Cargo.lock
-@@ -1826,6 +1826,7 @@ dependencies = [
-  "futures",
-  "fxhash",
-  "git-version",
-+ "gmp-mpfr-sys",
-  "hostname",
-  "hyper",
-  "hyper-tls",
-diff --git a/Cargo.toml b/Cargo.toml
-index 6e42de23..a50e3d47 100644
---- a/Cargo.toml
-+++ b/Cargo.toml
-@@ -63,6 +63,7 @@ hyper = { version = "0.14", features = ["full"] }
- hyper-tls = "0.5.0"
- tokio = { version = "1", features = ["full"] }
- futures = "0.3"
-+gmp-mpfr-sys = { version = "1.4.10", features = ["use-system-libs"] }
- 
- [dev-dependencies]
- assert_cmd = "1.0.3"
diff --git a/pkgs/development/compilers/scryer-prolog/default.nix b/pkgs/development/compilers/scryer-prolog/default.nix
index 739d600bf63d..4850f299dcbb 100644
--- a/pkgs/development/compilers/scryer-prolog/default.nix
+++ b/pkgs/development/compilers/scryer-prolog/default.nix
@@ -1,13 +1,12 @@
-{ stdenv
-, lib
-, fetchFromGitHub
+{ lib
 , rustPlatform
-, rustfmt
+, fetchFromGitHub
+, pkg-config
+, openssl
 , gmp
 , libmpc
 , mpfr
-, openssl
-, pkg-config
+, stdenv
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -21,19 +20,16 @@ rustPlatform.buildRustPackage rec {
     sha256 = "bDLVOXX9nv6Guu5czRFkviJf7dBiaqt5O8SLUJlcBZo=";
   };
 
-  cargoPatches = [
-    # Use system openssl, gmp, mpc and mpfr.
-    ./cargo.patch
-  ];
+  cargoSha256 = "sha256-tv/4GOl93nGLWyoAXY5roxRqS1twskkQTSddltH4n9U=";
 
-  cargoSha256 = "A6HtvxGTjJliDMUSGkQKB13FRyfBU4EPvrlZ97ic0Ic=";
-
-  nativeBuildInputs = [ pkg-config rustfmt];
+  nativeBuildInputs = [ pkg-config ];
   buildInputs = [ openssl gmp libmpc mpfr ];
 
+  CARGO_FEATURE_USE_SYSTEM_LIBS = true;
+
   meta = with lib; {
     broken = stdenv.isDarwin;
-    description = "A modern Prolog implementation written mostly in Rust.";
+    description = "A modern Prolog implementation written mostly in Rust";
     homepage = "https://github.com/mthom/scryer-prolog";
     license = with licenses; [ bsd3 ];
     maintainers = with maintainers; [ malbarbo ];