diff --git a/_do_build_scanner b/_do_build_scanner
index 08e75f3..ead05a5 100755
--- a/_do_build_scanner
+++ b/_do_build_scanner
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-source ./_build_vars
+. ./_build_vars
 go build \
     -o gonicscan \
     -tags "$(tr '\n' ' ' < _build_tags)" \
diff --git a/_do_build_server b/_do_build_server
index c3f8c5b..9929116 100755
--- a/_do_build_server
+++ b/_do_build_server
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-source ./_build_vars
+. ./_build_vars
 ./_do_gen_assets
 go build \
     -o gonic \
diff --git a/_do_run_scanner b/_do_run_scanner
index e810aa3..55c4392 100755
--- a/_do_run_scanner
+++ b/_do_run_scanner
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-source ./_build_vars
+. ./_build_vars
 go run \
     -tags "$(tr '\n' ' ' < _build_tags)" \
     cmd/gonicscan/main.go \
diff --git a/_do_run_server b/_do_run_server
index 1d84af6..5e524eb 100755
--- a/_do_run_server
+++ b/_do_run_server
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-source ./_build_vars
+. ./_build_vars
 ./_do_gen_assets
 go run \
     -tags "$(tr '\n' ' ' < _build_tags)" \