diff --git a/.github/workflows/scripts/linux/build-dependencies-qt.sh b/.github/workflows/scripts/linux/build-dependencies-qt.sh
index 6daaddc6c8..cbf7de10a2 100755
--- a/.github/workflows/scripts/linux/build-dependencies-qt.sh
+++ b/.github/workflows/scripts/linux/build-dependencies-qt.sh
@@ -13,6 +13,10 @@ SDL=SDL2-2.30.1
 QT=6.6.2
 LIBBACKTRACE=ad106d5fdd5d960bd33fae1c48a351af567fd075
 
+if [ "${INSTALLDIR:0:1}" != "/" ]; then
+	INSTALLDIR="$PWD/$INSTALLDIR"
+fi
+
 mkdir -p deps-build
 cd deps-build
 
diff --git a/.github/workflows/scripts/macos/build-dependencies.sh b/.github/workflows/scripts/macos/build-dependencies.sh
index ee99d98e9f..f8d524c872 100755
--- a/.github/workflows/scripts/macos/build-dependencies.sh
+++ b/.github/workflows/scripts/macos/build-dependencies.sh
@@ -20,6 +20,10 @@ WEBP=1.3.2
 FFMPEG=6.0
 QT=6.6.2
 
+if [ "${INSTALLDIR:0:1}" != "/" ]; then
+	INSTALLDIR="$PWD/$INSTALLDIR"
+fi
+
 mkdir -p deps-build
 cd deps-build