diff --git a/dev-lang/zig/zig-0.11.0-r1.ebuild b/dev-lang/zig/zig-0.11.0-r1.ebuild
index 90ffaa485d7e6..633b6e1c63999 100644
--- a/dev-lang/zig/zig-0.11.0-r1.ebuild
+++ b/dev-lang/zig/zig-0.11.0-r1.ebuild
@@ -112,6 +112,10 @@ pkg_setup() {
 }
 
 src_configure() {
+	# Useful for debugging and a little bit more deterministic.
+	export ZIG_LOCAL_CACHE_DIR="${T}/zig-local-cache"
+	export ZIG_GLOBAL_CACHE_DIR="${T}/zig-global-cache"
+
 	local mycmakeargs=(
 		-DZIG_USE_CCACHE=OFF
 		-DZIG_SHARED_LLVM=ON
diff --git a/dev-lang/zig/zig-9999.ebuild b/dev-lang/zig/zig-9999.ebuild
index 026d60e5a8541..9605234cfc43f 100644
--- a/dev-lang/zig/zig-9999.ebuild
+++ b/dev-lang/zig/zig-9999.ebuild
@@ -108,6 +108,10 @@ pkg_setup() {
 }
 
 src_configure() {
+	# Useful for debugging and a little bit more deterministic.
+	export ZIG_LOCAL_CACHE_DIR="${T}/zig-local-cache"
+	export ZIG_GLOBAL_CACHE_DIR="${T}/zig-global-cache"
+
 	local mycmakeargs=(
 		-DZIG_USE_CCACHE=OFF
 		-DZIG_SHARED_LLVM=ON