diff --git a/src/rendition.js b/src/rendition.js
index 05f4494..fb3e705 100644
--- a/src/rendition.js
+++ b/src/rendition.js
@@ -306,10 +306,7 @@ class Rendition {
 		this.displaying = displaying;
 
 		// Check if this is a book percentage
-		if (this.book.locations.length() &&
-				(isFloat(target) ||
-				(target === "1.0")) // Handle 1.0
-			) {
+		if (this.book.locations.length() && isFloat(target)) {
 			target = this.book.locations.cfiFromPercentage(parseFloat(target));
 		}
 
diff --git a/src/utils/core.js b/src/utils/core.js
index 749f22d..1be0fed 100644
--- a/src/utils/core.js
+++ b/src/utils/core.js
@@ -69,7 +69,16 @@ export function isNumber(n) {
  */
 export function isFloat(n) {
 	let f = parseFloat(n);
-	return f === n && isNumber(n) && (Math.floor(f) !== n);
+
+	if (isNumber(n) === false) {
+		return false;
+	}
+
+	if (typeof n === "string" && n.indexOf(".") > -1) {
+		return true;
+	}
+
+	return Math.floor(f) !== f;
 }
 
 /**