diff --git a/c/output/lrec_writers.c b/c/output/lrec_writers.c
index 96ed45a69..313ffb4cc 100644
--- a/c/output/lrec_writers.c
+++ b/c/output/lrec_writers.c
@@ -45,11 +45,7 @@ lrec_writer_t*  lrec_writer_alloc(cli_writer_opts_t* popts) {
 // ----------------------------------------------------------------
 lrec_writer_t* lrec_writer_alloc_or_die(cli_writer_opts_t* popts) {
 	lrec_writer_t* plrec_writer = lrec_writer_alloc(popts);
-	if (plrec_writer == NULL) {
-		fprintf(stderr, "%s: internal coding error detected in file \"%s\" at line %d.\n",
-			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
-		exit(1);
-	}
+	MLR_INTERNAL_CODING_ERROR_IF(plrec_writer == NULL);
 	return plrec_writer;
 }
 
diff --git a/c/output/multi_lrec_writer.c b/c/output/multi_lrec_writer.c
index d07982802..b8f6dabe4 100644
--- a/c/output/multi_lrec_writer.c
+++ b/c/output/multi_lrec_writer.c
@@ -35,11 +35,7 @@ void multi_lrec_writer_output_srec(multi_lrec_writer_t* pmlw, lrec_t* poutrec, c
 	if (pstate == NULL) {
 		pstate = mlr_malloc_or_die(sizeof(lrec_writer_and_fp_t));
 		pstate->plrec_writer = lrec_writer_alloc(pmlw->pwriter_opts);
-		if (pstate->plrec_writer == NULL) {
-			fprintf(stderr, "%s: internal coding error detected in file \"%s\" at line %d.\n",
-				MLR_GLOBALS.bargv0, __FILE__, __LINE__);
-			exit(1);
-		}
+		MLR_INTERNAL_CODING_ERROR_IF(pstate->plrec_writer == NULL);
 		pstate->filename_or_command = mlr_strdup_or_die(filename_or_command);
 		char* mode_string = get_mode_string(file_output_mode);
 		char* mode_desc = get_mode_desc(file_output_mode);
diff --git a/c/stream/stream.c b/c/stream/stream.c
index 794f23fd3..376d15b1c 100644
--- a/c/stream/stream.c
+++ b/c/stream/stream.c
@@ -29,11 +29,7 @@ int do_stream_chained(char* prepipe, slls_t* filenames, lrec_reader_t* plrec_rea
 {
 	FILE* output_stream = stdout;
 
-	if (pmapper_list->length < 1) { // Should not have been allowed by the CLI parser.
-		fprintf(stderr, "%s: internal coding error detected at file %s line %d.\n",
-			MLR_GLOBALS.bargv0, __FILE__, __LINE__);
-		exit(1);
-	}
+	MLR_INTERNAL_CODING_ERROR_IF(pmapper_list->length < 1); // Should not have been allowed by the CLI parser.
 
 	context_t ctx = { .nr = 0, .fnr = 0, .filenum = 0, .filename = NULL, .force_eof = FALSE };
 	int ok = 1;