1 files changed, 1 insertions, 1 deletions

diff --git a/lib/perfdata.c b/lib/perfdata.c
index 138df53b..f4eaf843 100644
--- a/lib/perfdata.c
+++ b/lib/perfdata.c
@@ -39,7 +39,7 @@ char *pd_to_string(mp_perfdata pd) {
         } else {
                 // we have an illegal single quote in the string
                 // replace it silently instead of complaining
-                for (char *ptr = pd.label; *ptr == '\0'; ptr++) {
+                for (char *ptr = pd.label; *ptr != '\0'; ptr++) {
                         if (*ptr == '\'') {
                                 *ptr = '_';
                         }