diff --git a/geoPHP.inc b/geoPHP.inc
index 12e7a335..b8db43a7 100644
--- a/geoPHP.inc
+++ b/geoPHP.inc
@@ -118,7 +118,13 @@ class geoPHP
   }
 
   static function bcmathInstalled() {
-    return extension_loaded('bcmath');
+    if (extension_loaded('bcmath')) {
+      // Set the BCMath scale to 24 to maintain precision in arithmetic that
+      // uses a lot of decimal places (ie: latitude/longitude).
+      bcscale(24);
+      return TRUE;
+    }
+    return FALSE;
   }
 
   static function geosInstalled($force = NULL) {