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-rw-r--r--bin/glitch.c1
-rw-r--r--bin/pngo.c1
2 files changed, 2 insertions, 0 deletions
diff --git a/bin/glitch.c b/bin/glitch.c
index 22d82c13..71664115 100644
--- a/bin/glitch.c
+++ b/bin/glitch.c
@@ -127,6 +127,7 @@ static struct PACKED {
     uint8_t filter;
     uint8_t interlace;
 } header;
+static_assert(13 == sizeof(header), "header size");
 
 static size_t lineSize(void) {
     switch (header.color) {
diff --git a/bin/pngo.c b/bin/pngo.c
index 7ca2d949..0859f1d6 100644
--- a/bin/pngo.c
+++ b/bin/pngo.c
@@ -132,6 +132,7 @@ static struct PACKED {
     enum PACKED { ADAPTIVE } filter;
     enum PACKED { PROGRESSIVE, ADAM7 } interlace;
 } header;
+static_assert(13 == sizeof(header), "header size");
 
 static size_t lineSize(void) {
     switch (header.color) {