diff --git a/demo-async.c b/demo-async.c
index d4d0d46..0cb7066 100644
--- a/demo-async.c
+++ b/demo-async.c
@@ -11,6 +11,8 @@ void on_key(termkey_t *tk, termkey_key *key)
 }
 
 int main(int argc, char *argv[]) {
+  TERMKEY_CHECK_VERSION;
+
   termkey_t *tk = termkey_new(0, 0);
 
   if(!tk) {
diff --git a/demo.c b/demo.c
index 96e2d24..7424d8f 100644
--- a/demo.c
+++ b/demo.c
@@ -3,6 +3,8 @@
 #include "termkey.h"
 
 int main(int argc, char *argv[]) {
+  TERMKEY_CHECK_VERSION;
+
   char buffer[50];
   termkey_t *tk = termkey_new(0, 0);
 
diff --git a/termkey.c b/termkey.c
index bebaa9a..f099f5f 100644
--- a/termkey.c
+++ b/termkey.c
@@ -8,6 +8,23 @@
 
 #include <stdio.h>
 
+void termkey_check_version(int major, int minor)
+{
+  if(major != TERMKEY_VERSION_MAJOR) {
+    fprintf(stderr, "libtermkey major version mismatch; %d (wants) != %d (library)\n",
+        major, TERMKEY_VERSION_MAJOR);
+    exit(1);
+  }
+
+  if(minor > TERMKEY_VERSION_MINOR) {
+    fprintf(stderr, "libtermkey minor version mismatch; %d (wants) > %d (library)\n",
+        minor, TERMKEY_VERSION_MINOR);
+    exit(1);
+  }
+
+  // Happy
+}
+
 static struct termkey_driver *drivers[] = {
   &termkey_driver_ti,
   &termkey_driver_csi,
diff --git a/termkey.h.in b/termkey.h.in
index 4849923..7f0dc49 100644
--- a/termkey.h.in
+++ b/termkey.h.in
@@ -7,6 +7,9 @@
 #define TERMKEY_VERSION_MAJOR @@VERSION_MAJOR@@
 #define TERMKEY_VERSION_MINOR @@VERSION_MINOR@@
 
+#define TERMKEY_CHECK_VERSION \
+        termkey_check_version(TERMKEY_VERSION_MAJOR, TERMKEY_VERSION_MINOR)
+
 typedef enum {
   TERMKEY_SYM_UNKNOWN = -1,
   TERMKEY_SYM_NONE = 0,
@@ -128,6 +131,8 @@ enum {
   TERMKEY_FLAG_NOTERMIOS   = 1 << 4, // Do not make initial termios calls on construction
 };
 
+void termkey_check_version(int major, int minor);
+
 termkey_t *termkey_new(int fd, int flags);
 void       termkey_free(termkey_t *tk);
 void       termkey_destroy(termkey_t *tk);