diff --git a/third_party/libopenjpeg/jp2.c b/third_party/libopenjpeg/jp2.c
index a0f639d8e..38715b80f 100644
--- a/third_party/libopenjpeg/jp2.c
+++ b/third_party/libopenjpeg/jp2.c
@@ -599,6 +599,7 @@ static OPJ_BOOL opj_jp2_read_ihdr(opj_jp2_t *jp2,
     }
 
     /* allocate memory for components */
+    opj_free(jp2->comps);
     jp2->comps = (opj_jp2_comps_t*) opj_calloc(jp2->numcomps,
                  sizeof(opj_jp2_comps_t));
     if (jp2->comps == 0) {
@@ -1897,6 +1898,7 @@ void opj_jp2_setup_decoder(opj_jp2_t *jp2, opj_dparameters_t *parameters)
 
     /* further JP2 initializations go here */
     jp2->color.jp2_has_colr = 0;
+    jp2->comps = NULL;
     jp2->ignore_pclr_cmap_cdef = parameters->flags &
                                  OPJ_DPARAMETERS_IGNORE_PCLR_CMAP_CDEF_FLAG;
 }
