diff --git a/src/server/simpleslave.c b/src/server/simpleslave.c
--- a/src/server/simpleslave.c
+++ b/src/server/simpleslave.c
@@ -174,7 +174,7 @@ if(updateConf){
   char *urltoJobfile; /* Used if we aren't using compression */
   char *pathtoJob; /* Path to job data folder */
   char *pathtoJobfile; /* Full path to the job's main file */
-  char *outputExt = "jpg";     /* Output Extension (e.g., JPG) */
+  char *outputExt;     /* Output Extension (e.g., JPG) */
 
   int haveWork = 0;
   int quit = 0;
diff --git a/src/server/slave.c b/src/server/slave.c
--- a/src/server/slave.c
+++ b/src/server/slave.c
@@ -188,7 +188,7 @@ int main(int argc, char *argv[])
 
   char *pathtoJob;     /* Full path to job data folder */
   char *pathtoJobfile; /* Full path to the job's main file */
-  char *outputExt = "jpg";     /* Output Extension (e.g., JPG) */
+  char *outputExt;     /* Output Extension (e.g., JPG) */
 
   int haveWork = 0;