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-rw-r--r--src/libutil/util.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index a640a64c724e..0bd51afd1a9f 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -96,6 +96,8 @@ Path absPath(Path path, Path dir)
 
 Path canonPath(const Path & path, bool resolveSymlinks)
 {
+    assert(path != "");
+
     string s;
 
     if (path[0] != '/')