diff --git a/Taskfile.yaml b/Taskfile.yaml
index 603633f..16a2cdd 100644
--- a/Taskfile.yaml
+++ b/Taskfile.yaml
@@ -3,7 +3,7 @@
 version: '3'
 
 vars:
-  PREFIX: '{{default "/usr/local" .PREFIX}}'
+  PREFIX: '{{default (eq .OS "darwin" | ternary "/usr/local" "/usr") .PREFIX}}'
   bindir__: '{{.PREFIX}}/bin'
   BINDIR: '{{default .bindir__ .BINDIR}}'
   libdir__: '{{.PREFIX}}/share/hilbish'