diff --git a/src/mat.c b/src/mat.c
index b217e73a..69a9921f 100644
--- a/src/mat.c
+++ b/src/mat.c
@@ -2444,7 +2444,9 @@ Mat_VarPrint(const matvar_t *matvar, int printdata)
                     const char *im = (const char *)complex_data->Im;
                     for ( i = 0; i < (size_t)sparse->njc - 1; i++ ) {
                         for ( j = sparse->jc[i];
-                              j < (size_t)sparse->jc[i + 1] && j < (size_t)sparse->ndata; j++ ) {
+                              j < (size_t)sparse->jc[i + 1] && j < (size_t)sparse->ndata &&
+                              j < (size_t)sparse->nir;
+                              j++ ) {
                             printf("    (%u,%" SIZE_T_FMTSTR ")  ", sparse->ir[j] + 1, i + 1);
                             Mat_PrintNumber(matvar->data_type, re + j * stride);
                             printf(" + ");