diff --git a/extent.cpp b/extent.cpp
index 8f811d2a..2992aa43 100644
--- a/extent.cpp
+++ b/extent.cpp
@@ -68,9 +68,11 @@ extent<T>::area (void) const
 
 //-----------------------------------------------------------------------------
 template <typename T>
-double
+float
 extent<T>::aspect (void) const
-    { return static_cast<double> (w) / h; }
+{
+    return static_cast<float> (w) / static_cast<float> (h);
+}
 
 
 //-----------------------------------------------------------------------------
diff --git a/extent.hpp b/extent.hpp
index 0b0e120c..6e33e5a0 100644
--- a/extent.hpp
+++ b/extent.hpp
@@ -37,7 +37,7 @@ namespace util {
         T    area  (void) const;
         T diameter (void) const;
 
-        double aspect (void) const;
+        float aspect (void) const;
 
         bool empty (void) const;