diff --git a/src/laws.test.c b/src/laws.test.c
index 9fd36d924..722b1dd8e 100644
--- a/src/laws.test.c
+++ b/src/laws.test.c
@@ -1714,8 +1714,6 @@ static void test_immigration(CuTest * tc)
     immigration();
     CuAssertIntEquals(tc, 2, rpeasants(r));
 
-    random_source_inject_array(inject, 2);
-
     config_set("rules.wage.function", "0");
     immigration();
     CuAssertIntEquals(tc, 2, rpeasants(r));
diff --git a/src/util/rand.c b/src/util/rand.c
index a14f1def4..e48c69f52 100644
--- a/src/util/rand.c
+++ b/src/util/rand.c
@@ -69,62 +69,53 @@ bool chance(double x)
 
 typedef struct random_source {
     double (*double_source) (void);
+    int (*int32_source) (void);
 } random_source;
 
 random_source *r_source = 0;
 
 double rng_injectable_double(void) {
-    if (r_source)
+    if (r_source && r_source->double_source)
         return r_source->double_source();
     return genrand_real2();
 }
 
-static double constant_value;
+int rng_injectable_int(void) {
+    if (r_source && r_source->int32_source)
+        return r_source->int32_source();
+    return (int)genrand_int31();
+}
 
-static double constant_source (void) {
-    return constant_value;
+static double constant_value_double;
+static int constant_value_int32;
+
+static double constant_double(void) {
+    return constant_value_double;
+}
+
+static int constant_int32(void) {
+    return constant_value_int32;
 }
 
 struct random_source constant_provider = {
-    constant_source
+    constant_double, NULL
 };
 
-void random_source_inject_constant(double value) {
-    constant_value = value;
+void random_source_inject_constant(double dval) {
+    constant_value_double = dval;
     r_source = &constant_provider;
 }
 
-static double *values;
-static int value_size;
-static int value_index;
-
-static double array_source (void) {
-    assert(value_index<value_size);
-    return values[value_index++];
-}
-
-struct random_source array_provider = {
-    array_source
+struct random_source constants_provider = {
+    constant_double, constant_int32
 };
 
-void random_source_inject_array(double inject[], int size) {
-    int i;
-    assert(size > 0);
-    value_size = size;
-    if (values)
-        free(values);
-    values = malloc(sizeof(double) * size);
-    if (!values) abort();
-    for (i=0; i < size; ++i) {
-        values[i] = inject[i];
-    }
-    value_index = 0;
-    r_source = &array_provider;
+void random_source_inject_constants(double dval, int ival) {
+    constant_value_double = dval;
+    constant_value_int32 = ival;
+    r_source = &constants_provider;
 }
 
 void random_source_reset(void) {
-    if (values)
-        free(values);
-    values = NULL;
     r_source = NULL;
 }
diff --git a/src/util/rand.h b/src/util/rand.h
index b659a68d3..a4178abf6 100644
--- a/src/util/rand.h
+++ b/src/util/rand.h
@@ -22,9 +22,10 @@ extern "C" {
        By calling the random_source_inject... functions you can set a special random source,
        which is handy for testing */
     double rng_injectable_double(void);
+    int rng_injectable_int(void);
 
+    void random_source_inject_constants(double dval, int ival);
     void random_source_inject_constant(double value);
-    void random_source_inject_array(double inject[], int size);
     void random_source_reset(void);
 
 #ifdef __cplusplus
diff --git a/src/util/rng.h b/src/util/rng.h
index 9c619b42e..42ebc5c57 100644
--- a/src/util/rng.h
+++ b/src/util/rng.h
@@ -9,11 +9,12 @@ extern "C" {
 
     /* generates a random number on [0,1)-real-interval */
     double rng_injectable_double(void);
+    int rng_injectable_int(void);
 
 #ifdef RNG_MT
 # include "mtrand.h"
 # define rng_init(seed) init_genrand(seed)
-# define rng_int (int)genrand_int31
+# define rng_int rng_injectable_int
 # define rng_uint (unsigned int)genrand_int32
 # define rng_double rng_injectable_double
 # define RNG_RAND_MAX 0x7fffffff