diff --git a/sys-devel/llvm/llvm20-20.1.4.recipe b/sys-devel/llvm/llvm20-20.1.4.recipe
index b3ebc99fb..ae31e936a 100644
--- a/sys-devel/llvm/llvm20-20.1.4.recipe
+++ b/sys-devel/llvm/llvm20-20.1.4.recipe
@@ -607,7 +607,7 @@ BUILD()
 		-DLLVM_TARGETS_TO_BUILD="AArch64;AMDGPU;ARM;RISCV;WebAssembly;X86" \
 		-DLIBOMP_INSTALL_ALIASES=OFF
 
-	cmake --build build -j2
+	cmake --build build -j1
 }
 
 INSTALL()