diff --git a/bpm-convert b/bpm-convert
index 57477c7..b1ff3d6 100755
--- a/bpm-convert
+++ b/bpm-convert
@@ -50,11 +50,12 @@ export BPM_WORKDIR="$TEMPDIR"
 export BPM_SOURCE="$TEMPDIR"/source
 export BPM_OUTPUT="$TEMPDIR"/output
 
+set -a
 source source.sh
+set +a
 
 if [[ $(type -t prepare) == function ]]; then
   echo "Running prepare() function..."
-  export -f prepare
   fakeroot bash -e -c prepare
   if [ $? -ne 0 ]; then
     echo "Failed to run prepare() function in source.sh"
@@ -64,7 +65,6 @@ fi
 cd "$BPM_SOURCE"
 if [[ $(type -t build) == function ]]; then
   echo "Running build() function..."
-  export -f build
   fakeroot bash -e -c build
   if [ $? -ne 0 ]; then
     echo "Failed to run build() function in source.sh"
@@ -74,7 +74,6 @@ fi
 cd "$BPM_SOURCE"
 if [[ $(type -t check) == function ]]; then
   echo "Running check() function..."
-  export -f check
   fakeroot bash -e -c check
   if [ $? -ne 0 ]; then
     echo "Failed to run check() function in source.sh"
@@ -86,7 +85,6 @@ if ! [[ $(type -t package) == function ]]; then
   exit 1
 fi
 echo "Running package() function..."
-export -f package
 fakeroot bash -e -c package
 if [ $? -ne 0 ]; then
   echo "Failed to run package() function in source.sh"