diff --git a/.ci/riscv-tests.sh b/.ci/riscv-tests.sh
index 14936fea..ac1a4441 100755
--- a/.ci/riscv-tests.sh
+++ b/.ci/riscv-tests.sh
@@ -9,6 +9,8 @@ set -x
 
 export PATH=`pwd`/toolchain/bin:$PATH
 
+PARALLEL=-j$(nproc)
+
 make distclean
 # Rebuild with all RISC-V extensions
 # FIXME: To pass the RISC-V Architecture Tests, full access to 4 GiB is
@@ -16,7 +18,7 @@ make distclean
 # for this purpose, although the emulator can run all selected benchmarks with
 # much smaller memory mapping regions.
 make ENABLE_EXT_M=1 ENABLE_EXT_A=1 ENABLE_EXT_F=1 ENABLE_EXT_C=1 \
-     ENABLE_Zicsr=1 ENABLE_Zifencei=1 ENABLE_FULL4G=1
-make arch-test RISCV_DEVICE=IMAFCZicsrZifencei || exit 1
-make arch-test RISCV_DEVICE=FCZicsr || exit 1
-make arch-test RISCV_DEVICE=IMZbaZbbZbcZbs || exit 1
+     ENABLE_Zicsr=1 ENABLE_Zifencei=1 ENABLE_FULL4G=1 $PARALLEL
+make arch-test RISCV_DEVICE=IMAFCZicsrZifencei $PARALLEL || exit 1
+make arch-test RISCV_DEVICE=FCZicsr $PARALLEL || exit 1
+make arch-test RISCV_DEVICE=IMZbaZbbZbcZbs $PARALLEL || exit 1