diff --git a/regression/cbmc/cprover_bool1/main.c b/regression/cbmc/cprover_bool1/main.c
new file mode 100644
index 00000000000..f9af057ad0c
--- /dev/null
+++ b/regression/cbmc/cprover_bool1/main.c
@@ -0,0 +1,8 @@
+#include <assert.h>
+
+int main()
+{
+  int y;
+  __CPROVER_bool x = y;
+  assert(x != (__CPROVER_bool)y);
+}
diff --git a/regression/cbmc/cprover_bool1/test.desc b/regression/cbmc/cprover_bool1/test.desc
new file mode 100644
index 00000000000..20a1bea26ec
--- /dev/null
+++ b/regression/cbmc/cprover_bool1/test.desc
@@ -0,0 +1,10 @@
+CORE
+main.c
+--trace
+^EXIT=10$
+^SIGNAL=0$
+^VERIFICATION FAILED$
+x != \(__CPROVER_bool\)y
+--
+x != \(_Bool\)y
+^warning: ignoring
diff --git a/src/ansi-c/expr2c.cpp b/src/ansi-c/expr2c.cpp
index 5e8572e82b1..05e779af40a 100644
--- a/src/ansi-c/expr2c.cpp
+++ b/src/ansi-c/expr2c.cpp
@@ -205,7 +205,7 @@ std::string expr2ct::convert_rec(
 
   if(src.id()==ID_bool)
   {
-    return q+"_Bool"+d;
+    return q + CPROVER_PREFIX + "bool" + d;
   }
   else if(src.id()==ID_c_bool)
   {