diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index 38be934..97d87f6 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -1019,7 +1019,7 @@
 
     std::string partition_size_str;
     if (fb->GetVar("partition-size:" + partition, &partition_size_str) != fastboot::SUCCESS) {
-        die("cannot get boot partition size");
+        die("cannot get partition size for %s", partition.c_str());
     }
 
     partition_size_str = fb_fix_numeric_var(partition_size_str);