diff --git a/magick/coder.c b/magick/coder.c
index 264ac74..08f5856 100644
--- a/magick/coder.c
+++ b/magick/coder.c
@@ -282,11 +282,11 @@
 {
   if (coder_semaphore == (SemaphoreInfo *) NULL)
     AcquireSemaphoreInfo(&coder_semaphore);
-  LockSemaphoreInfo(coder_semaphore);
+  (void) LockSemaphoreInfo(coder_semaphore);
   if (coder_list != (SplayTreeInfo *) NULL)
     coder_list=DestroySplayTree(coder_list);
   instantiate_coder=MagickFalse;
-  UnlockSemaphoreInfo(coder_semaphore);
+  (void) UnlockSemaphoreInfo(coder_semaphore);
   DestroySemaphoreInfo(&coder_semaphore);
 }
 
@@ -403,7 +403,7 @@
   /*
     Generate coder list.
   */
-  LockSemaphoreInfo(coder_semaphore);
+  (void) LockSemaphoreInfo(coder_semaphore);
   ResetSplayTreeIterator(coder_list);
   p=(const CoderInfo *) GetNextValueInSplayTree(coder_list);
   for (i=0; p != (const CoderInfo *) NULL; )
@@ -413,7 +413,7 @@
       coder_map[i++]=p;
     p=(const CoderInfo *) GetNextValueInSplayTree(coder_list);
   }
-  UnlockSemaphoreInfo(coder_semaphore);
+  (void) UnlockSemaphoreInfo(coder_semaphore);
   qsort((void *) coder_map,(size_t) i,sizeof(*coder_map),CoderInfoCompare);
   coder_map[i]=(CoderInfo *) NULL;
   *number_coders=(unsigned long) i;
@@ -488,7 +488,7 @@
   /*
     Generate coder list.
   */
-  LockSemaphoreInfo(coder_semaphore);
+  (void) LockSemaphoreInfo(coder_semaphore);
   ResetSplayTreeIterator(coder_list);
   p=(const CoderInfo *) GetNextValueInSplayTree(coder_list);
   for (i=0; p != (const CoderInfo *) NULL; )
@@ -498,7 +498,7 @@
       coder_map[i++]=ConstantString(p->name);
     p=(const CoderInfo *) GetNextValueInSplayTree(coder_list);
   }
-  UnlockSemaphoreInfo(coder_semaphore);
+  (void) UnlockSemaphoreInfo(coder_semaphore);
   qsort((void *) coder_map,(size_t) i,sizeof(*coder_map),CoderCompare);
   coder_map[i]=(char *) NULL;
   *number_coders=(unsigned long) i;
@@ -534,14 +534,14 @@
     {
       if (coder_semaphore == (SemaphoreInfo *) NULL)
         AcquireSemaphoreInfo(&coder_semaphore);
-      LockSemaphoreInfo(coder_semaphore);
+      (void) LockSemaphoreInfo(coder_semaphore);
       if ((coder_list == (SplayTreeInfo *) NULL) &&
           (instantiate_coder == MagickFalse))
         {
           (void) LoadCoderLists(MagickCoderFilename,exception);
           instantiate_coder=MagickTrue;
         }
-      UnlockSemaphoreInfo(coder_semaphore);
+      (void) UnlockSemaphoreInfo(coder_semaphore);
     }
   return(coder_list != (SplayTreeInfo *) NULL ? MagickTrue : MagickFalse);
 }