diff --git a/Dockerfile b/Dockerfile
index aa40bb6..c15ee9d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -85,7 +85,7 @@ RUN set -e; \
       git clone --depth 1 --branch "${EXCHANGE_REF}" https://git.taler.net/exchange.git /src/exchange; \
       EXCHANGE_DIR="/src/exchange"; \
     fi; \
-    cd "${EXCHANGE_DIR}" && env GNUNET_PREFIX=/usr ./bootstrap && \
+    cd "${EXCHANGE_DIR}" && env GNUNET_PREFIX=/usr GIT_CONFIG_NOSYSTEM=1 GIT_DIR= GIT_WORK_TREE=. ./bootstrap && \
     ./configure --prefix=/usr && make -j$(nproc) && make install; \
     # Merchant
     MERCHANT_DIR=""; \
@@ -106,7 +106,7 @@ RUN set -e; \
       git clone --depth 1 --branch "${MERCHANT_REF}" https://git.taler.net/merchant.git /src/merchant; \
       MERCHANT_DIR="/src/merchant"; \
     fi; \
-    cd "${MERCHANT_DIR}" && env GNUNET_PREFIX=/usr ./bootstrap && \
+    cd "${MERCHANT_DIR}" && env GNUNET_PREFIX=/usr GIT_CONFIG_NOSYSTEM=1 GIT_DIR= GIT_WORK_TREE=. ./bootstrap && \
     ./configure --prefix=/usr && make -j$(nproc) && make install
 
 # LibEuFin (Bank)