1 files changed, 4 insertions, 2 deletions

diff --git a/plugins/check_snmp.c b/plugins/check_snmp.c
index 425bb7b2..135bbc7c 100644
--- a/plugins/check_snmp.c
+++ b/plugins/check_snmp.c
@@ -158,6 +158,7 @@ int perf_labels = 1;
 char* ip_version = "";
 double multiplier = 1.0;
 char *fmtstr = "";
+bool fmtstr_set = false;
 char buffer[DEFAULT_BUFFER_SIZE];
 
 static char *fix_snmp_range(char *th)
@@ -423,7 +424,7 @@ main (int argc, char **argv)
                 else if (strstr (response, "INTEGER: ")) {
                         show = multiply (strstr (response, "INTEGER: ") + 9);
 
-                        if (strcmp(fmtstr, "") != 0) {
+                        if (fmtstr_set) {
                                 conv = fmtstr;
                         }
                 }
@@ -973,6 +974,7 @@ process_arguments (int argc, char **argv)
                 case 'f':
                         if (multiplier != 1.0) {
                                 fmtstr=optarg;
+                                fmtstr_set = true;
                         }
                         break;
                 }
@@ -1187,7 +1189,7 @@ multiply (char *str)
         if(verbose>2)
                 printf("    multiply extracted double: %f\n", val);
         val *= multiplier;
-        if (strcmp(fmtstr, "") != 0) {
+        if (fmtstr_set) {
                 conv = fmtstr;
         }
         if (val == (int)val) {