diff --git a/syntax/go.nanorc b/syntax/go.nanorc
index 6be9df14..1a38dd58 100644
--- a/syntax/go.nanorc
+++ b/syntax/go.nanorc
@@ -24,9 +24,9 @@ color brightcyan "\<(package|import)\>"
 color brightcyan "//[[:space:]]*\+build[[:space:]]+(([a-zA-Z_0-9]+[[:space:]]*)+,[[:space:]]*)*[a-zA-Z_0-9]+"
 
 # Literals.
-color red "\<[0-9]+\.[0-9]*([Ee][+-][0-9]+)?i?\>"
-color red "\<[0-9]+[Ee][+-][0-9]+i?\>"
-color red "\B\.[0-9]+([Ee][+-][0-9]+)?i?\>"
+color red "\<[0-9]+\.[0-9]*([Ee][+-]?[0-9]+)?i?\>"
+color red "\<[0-9]+[Ee][+-]?[0-9]+i?\>"
+color red "\B\.[0-9]+([Ee][+-]?[0-9]+)?i?\>"
 color red "\<[0-9]+i\>"
 color red "\<[1-9][0-9]*\>"
 color red "\<0[0-7]*\>"