diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0a4edcb..56c2ff9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,9 +8,9 @@ if (NOT MAN_OUTPUT_PATH)
 endif()
 
 # set some options
-#set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -Wall -Wextra -g -std=c99 -Wno-unused-result")
+#set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -Wall -Wextra -g -std=c11 -Wno-unused-result")
 #set(CMAKE_BUILD_TYPE Debug)
-set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -Wall -Wextra -Os -std=c99 -Wno-unused-result")
+set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -Wall -Wextra -Os -std=c11 -Wno-unused-result")
 set(CMAKE_BUILD_TYPE Release)
 
 set(SRC ${PROJECT_SOURCE_DIR}/src)
diff --git a/src/catimg.c b/src/catimg.c
index 151a616..185e3d1 100644
--- a/src/catimg.c
+++ b/src/catimg.c
@@ -3,7 +3,7 @@
 #include <string.h>
 #include "sh_image.h"
 #include "sh_utils.h"
-#include <unistd.h>
+#include <time.h>
 #include <signal.h>
 
 #define USAGE "Usage: catimg [-hct] [-w width] [-l loops] [-r resolution] image-file\n\n" \
@@ -58,6 +58,14 @@ char supportsUTF8() {
         || (LC_CTYPE && strstr(LC_CTYPE, UTF));
 }
 
+// sleep for at least delay / 100 seconds
+void mysleep(const uint16_t delay) {
+    struct timespec time;
+    time.tv_sec = delay / 100;
+    time.tv_nsec = (delay - 100 * (time.tv_sec)) * 10000;
+    while (nanosleep(&time, &time));
+}
+
 int main(int argc, char *argv[])
 {
     init_hash_colors();
@@ -140,9 +148,9 @@ int main(int argc, char *argv[])
         for (uint32_t frame = 0; frame < img.frames; frame++) {
             if (frame > 0 || loop > 0) {
                 if (frame > 0)
-                    usleep(img.delays[frame - 1] * 10000);
+                    mysleep(img.delays[frame - 1]);
                 else
-                    usleep(img.delays[img.frames - 1] * 10000);
+                    mysleep(img.delays[img.frames - 1]);
                 printf("\e[u");
             }
             uint32_t index, x, y;