diff --git a/pkgs/by-name/tr/tree-sitter/package.nix b/pkgs/by-name/tr/tree-sitter/package.nix
index f16b467c5821..ebd2c362f222 100644
--- a/pkgs/by-name/tr/tree-sitter/package.nix
+++ b/pkgs/by-name/tr/tree-sitter/package.nix
@@ -193,6 +193,13 @@ rustPlatform.buildRustPackage (finalAttrs: {
       substituteInPlace ./Makefile \
           --replace-fail 'all: libtree-sitter.a libtree-sitter.$(SOEXT) tree-sitter.pc' 'all: libtree-sitter.a tree-sitter.pc'
       sed -i '/^install:/,/^[^[:space:]]/ { /$(SOEXT/d; }' ./Makefile
+    ''
+    # rquickjs-sys passes the raw rust target to clang, which does not know riscv64gc
+    + lib.optionalString stdenv.hostPlatform.isRiscV64 ''
+      substituteInPlace $cargoDepsCopy/source-*/rquickjs-sys-*/build.rs \
+        --replace-fail \
+          'let mut cflags = vec![format!("--target={}", target)];' \
+          'let mut cflags = vec![format!("--target={}", target.replace("riscv64gc", "riscv64"))];'
     '';
 
   # The Makefile install can't enable the wasm feature.