diff --git a/pandas/_libs/include/pandas/vendored/klib/khash_python.h b/pandas/_libs/include/pandas/vendored/klib/khash_python.h
index 0311f168dcc4a..76b212a4b4660 100644
--- a/pandas/_libs/include/pandas/vendored/klib/khash_python.h
+++ b/pandas/_libs/include/pandas/vendored/klib/khash_python.h
@@ -3,8 +3,8 @@
 
 
 typedef struct {
-    double real;
-    double imag;
+    float real;
+    float imag;
 } khcomplex64_t;
 typedef struct {
     double real;
@@ -93,9 +93,9 @@ khuint64_t PANDAS_INLINE asuint64(double key) {
     return val;
 }
 
-khuint32_t PANDAS_INLINE asuint32(double key) {
+khuint32_t PANDAS_INLINE asuint32(float key) {
     khuint32_t val;
-    memcpy(&val, &key, sizeof(double));
+    memcpy(&val, &key, sizeof(float));
     return val;
 }
 
@@ -115,9 +115,9 @@ khuint32_t PANDAS_INLINE kh_float64_hash_func(double val){
     return murmur2_64to32(as_int);
 }
 
-khuint32_t PANDAS_INLINE kh_float32_hash_func(double val){
+khuint32_t PANDAS_INLINE kh_float32_hash_func(float val){
     // 0.0 and -0.0 should have the same hash:
-    if (val == 0.0){
+    if (val == 0.0f){
         return ZERO_HASH;
     }
     // all nans should have the same hash:
diff --git a/pandas/_libs/khash.pxd b/pandas/_libs/khash.pxd
index 06595f44a591a..c439e1cca772b 100644
--- a/pandas/_libs/khash.pxd
+++ b/pandas/_libs/khash.pxd
@@ -29,8 +29,8 @@ cdef extern from "pandas/vendored/klib/khash_python.h":
         "kh_complex_hash_equal" (khcomplex128_t a, khcomplex128_t b) nogil
 
     ctypedef struct khcomplex64_t:
-        double real
-        double imag
+        float real
+        float imag
 
     bint are_equivalent_khcomplex64_t \
         "kh_complex_hash_equal" (khcomplex64_t a, khcomplex64_t b) nogil