diff --git a/src/Makevars b/src/Makevars
index a48a01c..7cf9d35 100644
--- a/src/Makevars
+++ b/src/Makevars
@@ -22,7 +22,7 @@ $(STATLIB):
 		if [ "$(NOT_CRAN)" != "true" ]; then \
  			export CARGO_HOME=$(CARGOTMP); \
 		fi && \
-		cargo build --lib --release --offline --config rust/config/cargo-config.toml --manifest-path=./rust/Cargo.toml --target-dir $(TARGET_DIR)
+		cargo build --lib --release --offline --config rust/config/cargo-config.toml --manifest-path=./rust/Cargo.toml --target-dir $(TARGET_DIR) --jobs 1
 
 	# we clean headers to avoid a message like
 	# Found the following sources/headers with CR or CRLF line endings: