diff --git a/cpp_coveralls/coverage.py b/cpp_coveralls/coverage.py
index f39f44d..8710ade 100644
--- a/cpp_coveralls/coverage.py
+++ b/cpp_coveralls/coverage.py
@@ -249,9 +249,12 @@ def parse_gcov_file(args, fobj, filename):
         report_fields = line.decode('utf-8', 'replace').split(':', 2)
         if len(report_fields) == 1:
             continue
+        line_num = report_fields[1].strip()
+        if line_num == '':
+            continue
 
         cov_num = report_fields[0].strip()
-        line_num = int(report_fields[1].strip())
+        line_num = int(line_num)
         text = report_fields[2]
         if line_num == 0:
             continue