diff --git a/com.google.eclipse.protobuf.test/src/com/google/eclipse/protobuf/conversion/FLOATValueConverter_toValue_Test.java b/com.google.eclipse.protobuf.test/src/com/google/eclipse/protobuf/conversion/FLOATValueConverter_toValue_Test.java
index 520e078..03e58d8 100644
--- a/com.google.eclipse.protobuf.test/src/com/google/eclipse/protobuf/conversion/FLOATValueConverter_toValue_Test.java
+++ b/com.google.eclipse.protobuf.test/src/com/google/eclipse/protobuf/conversion/FLOATValueConverter_toValue_Test.java
@@ -39,6 +39,9 @@
   @Parameters
   public static Collection<Object[]> parameters() {
     return asList(new Object[][] {
+      { "52e3", 52e3F },
+      { "52E3", 52e3F },
+      { "6e-3", 0.006F },
       { "6.8", 6.8F },
       { "-3.1", -3.1F },
       { ".3", 0.3F }
diff --git a/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/Protobuf.xtext b/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/Protobuf.xtext
index c9f1c3a..3c3a1bd 100644
--- a/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/Protobuf.xtext
+++ b/com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/Protobuf.xtext
@@ -143,7 +143,7 @@
   float=FLOAT;
 
 terminal FLOAT returns ecore::EFloat:
-  ('-')? (NUMBER)* ('.' (NUMBER)+)?;
+  ('-')? (NUMBER)* ('.' (NUMBER)+)? (('e'|'E')('-')? (NUMBER)+)?;
 
 StringRef:
   string=STRING;