diff --git a/src/prefix.jl b/src/prefix.jl
index 36e742e..6209aa0 100644
--- a/src/prefix.jl
+++ b/src/prefix.jl
@@ -21,6 +21,9 @@ Base.:*(x, y::SIPrefix) = x  * y.factor
 Base.:/(x::SIPrefix, y) = x.factor / y
 Base.:/(x, y::SIPrefix) = x / y.factor
 
+Base.:^(x::SIPrefix, y) = x.factor ^ y
+Base.:^(x, y::SIPrefix) = x ^ y.factor
+
 # Prefixes > 1
 const quetta = SIPrefix("quetta", "Q", 1e30)
 const ronna = SIPrefix("ronna", "R", 1e27)