diff --git a/src/ciderlib/oned/onemesh.c b/src/ciderlib/oned/onemesh.c
index e05d24ba5..f7135c2d3 100644
--- a/src/ciderlib/oned/onemesh.c
+++ b/src/ciderlib/oned/onemesh.c
@@ -72,7 +72,7 @@ ONEbuildMesh(ONEdevice *pDevice, ONEcoord *pCoord, ONEdomain *pDomain,
   for (index = 2; index < pDevice->numNodes; index++) {
     pNode = nodeArray[index];
     if (!pNode->nodeType) {
-      printf("Error: No domain defined for node %d\n", pNode->nodeI);
+      fprintf(stderr, "Error: No domain defined for node %d\n", pNode->nodeI);
       error = TRUE;
     }
   }
diff --git a/src/frontend/com_measure2.c b/src/frontend/com_measure2.c
index 4724beca5..89b80ecb5 100644
--- a/src/frontend/com_measure2.c
+++ b/src/frontend/com_measure2.c
@@ -77,9 +77,8 @@ static void measure_errMessage(const char *mName, const char *mFunction,
         const char *trigTarg, const char *errMsg, int chk_only)
 {
     if (!chk_only) {
-        printf("\nError: measure  %s  %s(%s) : ", mName, mFunction, trigTarg);
-        printf("%s", errMsg);
-        // printf("\tmeasure '%s'  failed\n", mName);
+        fprintf(stderr, "\nError: measure  %s  %s(%s) : ", mName, mFunction, trigTarg);
+        fprintf(stderr, "%s", errMsg);
     }
 }
 
@@ -1629,9 +1628,9 @@ get_measure2(
     }
 
     if (wl_cnt < 3) {
-        printf("\tmeasure '%s'  failed\n", mName);
-        printf("Error: measure  %s  :\n", mName);
-        printf("\tinvalid num params\n");
+        fprintf(stderr, "\tmeasure '%s'  failed\n", mName);
+        fprintf(stderr, "Error: measure  %s  :\n", mName);
+        fprintf(stderr, "\tinvalid num params\n");
         tfree(mName);
         tfree(mAnalysis);
         tfree(mFunction);
@@ -2056,8 +2055,8 @@ err_ret7:
     case AT_ERR2:
     case AT_ERR3:
     {
-        printf("\nError: measure  %s failed:\n", mName);
-        printf("\tfunction '%s' currently not supported\n\n", mFunction);
+        fprintf(stderr, "\nError: measure  %s failed:\n", mName);
+        fprintf(stderr, "\tfunction '%s' currently not supported\n\n", mFunction);
         tfree(mFunction);
         break;
     }